All we know so far is that it's likely connected to L&P using Blender, and his statement about it being the perfect time to introduce the new feature for part 2 of AWAM due to increasingly hot events. He also mentioned that it's something he wanted to do for a long time. To me, all of this sounds like an effort to include actual animations to the game.
Problem with that is, if it's indeed animations, the huge delays don't make any sense. L&P himself said the update is gonna be short, and no skilled artist (the multiple skilled artists he's apparently found, and something about missing a guy for "the last part", whatever that's supposed to mean) would need several months to add a couple animations to a short update. There's not even gonna be enough "hot" content to implement an amount of animations justifying the huge delays.
Another thing that doesn't add up is his latest statement about moving on to update 2/10 without releasing the first one, as his "helper" apparently still needs more time to complete the task. UNLESS there is no other developer, which could explain why he's not ready to release update 1/10 if he still couldn't manage to create a solid animation matching his standards.
Anyway, in the end we don't know what this new feature's supposed to be. All I know is that it's gotta blow my head off my shoulders after all the hype he's produced regarding this "special" addition to the game, which I doubt is gonna happen.