A SFX pack? Wish I could make it myself. I no longer have a computer capable of making one.
But yeah rayman origins looks promising, and as a rayman fan myself I am sure to be getting it! Wanna know something funny? With the original Rayman game, if I dropped my playsation with it playing, it would skip to the final cutseen saying I won the game 
EDIT: Got bored, edited the op a bit. I've lowerd Raymans vertical count on his hands OVER 8000!!!!!!!!!!!!! to something like 2000 so the slight lag that Rayman was causing should be gone in the next update. Also I think I'm going to skip on a moving mouth. Those teeth blend into each other in annoying ways, as well as it being a maze to find every vertical point (Which I still haven't been able to do!) and thanks to NaruZeldaMaster with his tutorial I should be able to provide BOTH hands fully rigged next time(Considering I have to start rigging his hands from the start again) I don't have a capable computer too,my one is 64 bit and I can't preview waves.If I could I would sure make a SFX pak for you! You have all my suppor in your project! And if you think that's useful,I have already done some recolors! Those are:
-Blue Shirt
-Black Shirt and purple hood
-Red Shirt and Yellow hood
-Yellow shirt and red hood
-Green shirt and white hood
I would be glad of making the official recolors for your Rayman project.
Personally I think a movable mouth would be important because I think that for a perfect hack he would need his typical grimace!