Can I list a bunch of ASM differences in more detail? (Does this count as a bump, if so please don't kill me)

• The idle has Mario/Luigi turning their head from left to right at 90° angles. This also happens in the item hold animation as well, which wasn't changed in the final, oddly. I believe the old idle is still in the final as the worldmap idle animation.

• Characters turn direction much slower. (About 5 frames of turning around)

• There is another, slower stage of walking. Mario's slow walk animation ended up being used in the intro, Luigi had a different one than Mario in the beta but ended up using Mario's slow walk in the intro.

• The normal walking animation from the final was used when you gained a bit more momentum. The animation used in the final game but the animation was played slower initially (at least in some builds) in the beta.
(Source: https://youtu.be/dPvVdbBvDqI?t=14s)

• The jump sound is different, it sounds nearly identical to the one in Super Mario Bros. for the NES and changes depending on if you have a mushroom or not.

• There is no transition from jumping to falling. This also applies to Mega Mushroom forms as well. Also, when the character switches to the falling animation, they switch to their hatless model and their hat spawns on top of them and gradually gains a vertical offset.

• Yellow/orange star shaped particles emit from the players upon getting hit or colliding with another player. Also, the animation for a player being stomped is just the crouch animation. Players do not fall upon being stomped like in the final.
(Source: https://youtu.be/WaOJEReEhIo?t=18s)

• Players don't glow rainbow when they have the Star.

• There are no particles when a character obtains a Mega Mushroom.

• Mega Mario uses normal Mario's falling animation in the 2005 trailer: (https://youtu.be/WaOJEReEhIo?t=35s), but uses his final falling animation in the beta kiosk gameplay footage here: (https://youtu.be/Ie46F2gwBfA?t=3m23s) Perhaps the playable kiosks had a later build than that of the trailer?

• Mega Mario isn't viewed from the side like the final. He's viewed a bit more toward the camera like normal Mario. Also his idle is probably the same as non mega characters.

• Mega Mario's walk is similar to the final but the arm animation is different and the walking animation speeds up depending on your velocity.
(Source: https://youtu.be/Ie46F2gwBfA?t=3m26s)

• Mega Mario can kick and punch. Note: Mario seems to tilt his head a little more in the kick here: (https://youtu.be/WaOJEReEhIo?t=35s) as compared to here: (https://youtu.be/Ie46F2gwBfA?t=3m35s)

• Koopas don't go into their shell when hit by Mega Mario / Fireballs or Star. (presumably)
(Source: https://youtu.be/c9r99rNi-6s?t=214)

• Enemies fly and spin off the screen when kicked by Mega Mario.
(Sources: https://youtu.be/1339IZd6yT8?t=28 https://youtu.be/c9r99rNi-6s?t=204)

• Characters do a flip when bouncing off each other. This flip is identical to the flip they do jumping off the flagpole.
(Source: https://youtu.be/WaOJEReEhIo?t=18s)

• Characters can cancel wall-cling into ground-pound. Also, there are animations for consecutive wall-jumping.
(Source: https://youtu.be/Ie46F2gwBfA?t=2m9s)

• Characters can perform the SM64 triple jump / consecutive jump. The second jump animation was used as the first enemy chain animation.
(Source: https://youtu.be/Ie46F2gwBfA?t=16s)

• There also seems to be another sort of consecutive jump which looks similar to the triple jump variations in the NSMB sequels
(Source: https://youtu.be/Ie46F2gwBfA?t=2m27s) Note: The final triple jump can also be performed, as seen in the 2005 trailer.

• Characters can perform some sort of forward side somersault.
(Source: https://youtu.be/Ie46F2gwBfA?t=23s)

• Characters move on ceiling ropes much slower.
(Source: https://youtu.be/Ie46F2gwBfA?t=1m16s)

• Fireballs have a white particle effect when hitting an enemy or wall, instead of a more red one.
(Source: https://youtu.be/ev3ZomBMDew?t=76)

• The end of course flag is a flat red flag that faces right and uses a normal block at the bottom.

• The end castle is missing.

• The flag slide sound effect sounds different, and the victory theme starts earlier.
(Source: https://youtu.be/Ie46F2gwBfA?t=3m46s)

• During the victory animation the camera zooms much father in to Mario than in the final. After the victory animation, rather than the camera zooming out, it just pans slowly to the right as the player walks to the right while a cutout of Mario's head zooms out at the center of the screen. Also, Mario doesn't say anything when doing his victory animation.
(Source: https://youtu.be/Ie46F2gwBfA?t=3m51s)

• The victory animation after beating a castle boss is different. (https://youtu.be/j01eGxUFNfU?t=19s) A different variation is found here: (https://youtu.be/Ie46F2gwBfA?t=3m14s) suggesting it was changed at some point.

• Not only do power up state changes not freeze time, they don't use the stretching effect like in the final game and instead just flash between the big and small character models. (Source: https://youtu.be/Ie46F2gwBfA?t=2m48s)

• Upon touching a checkpoint ring, it awards 1000 points, turns red, and awards a checkpoint. It also makes a different sound, which sounds like a pitched down version of the 'item get' sound.
(Source: https://youtu.be/L16AxOA9qgo?t=1m9s)

• The font for points is identical, but floating point awards have a sparkle particle effect when disappearing.
(Source: https://youtu.be/Ie46F2gwBfA?t=1s)

• The sound for a P-Switch being hit is the same sound as one appearing in the final.
(Source: https://youtu.be/Ie46F2gwBfA?t=2m34s)

• Stomping an enemy plays a lower pitched version of the squish sound from SM64DS play as well as the jump sound.
(Source: https://youtu.be/WaOJEReEhIo?t=10s)

• Kicking Koopa Shells seemingly makes the screen zoom out.
(Source: https://youtu.be/1339IZd6yT8?t=4)

• Spindrifts from Super Mario 64 are seen here, they act like springboards that disappear and emit coins when jumped on.
(Source: https://youtu.be/WaOJEReEhIo?t=47)

• The drill stomp has no particle or sound effect associated with it, and is cancellable (likely by letting go of down or pressing up).
(Source: https://youtu.be/MeD5YIoHvVs?t=1m11s)

• The "item reserve" sound effect seems to be different, sounding more like the NSMBWii one.
(Source: https://youtu.be/ev3ZomBMDew?t=92)

• On top of this the "item use" sound in the beta is the same as the "item get" sound of the final.
(Source: https://youtu.be/PRjzqc2l6Yw?t=67)

• Big Dry Bones can be taken down just by being stomped rather than ground-pounded like in the final.
(Source: https://youtu.be/AZS21dde4VY?t=6)

• The touchscreen UI in the E3 2005 trailer of NSMB looks different to the kiosk gameplay and screenshots of that year. In the trailer the text "score" and "no item" is grey, while in other screenshots and kiosk gameplay the "score" text is blue and the "no item" text is brown. Also exclusive to the trailer is an icon to the left of the coins and timer that looks like a front facing version of either Mario or Luigi's head depending on the player, with a number below it. I assume that this was most likely a lives counter.

By the way, Is this project still alive? And if so, is there any way I can contribute?
I'm quite good with GIMP, pixel art and image modification. Not so good with NSMB hacking though.

EDIT: A lot of the beta animations are still in the final game, I made a video featuring them here:
https://youtu.be/WEO2evDPtHw

Maybe, Just Maybe it might be realeased soon! (Probably Not)

edit: stupid post is stupid

The Mega Mushroom ? Block animation Appears in https://youtu.be/rYdj5SRsY70?t=2m37s

I noticed that most of the UI rips of the beta are from beta screenshots and look a bit grainy, so I traced over the screenshots to make the art look smooth. There's probably more colours than the DS can handle, but eh.

Also sorry for necroposting.