They won't have to spend much at all on AA's, as they will probably just reskin the ones they're currently using for Splash. The biggest part of the budget is probably going to go to changing the top of the mountain and the set pieces in side the ride. I'm sure there will be at least one new AA though that is more advanced that they put in here just for the sake of showing off. I'd put my money on either Tiana or Facillier for that piece. The only reason i'm not 100% saying Facillier is because this is set after the movie, so we don't know the extent of his involvement in the ride. It's very possible he is just shown in ghost form via projection mapping as we enter the final lift hill.