I need people who have played him at Smash Fest and other events to tell me which moves are mapped to which buttons. I have a video with most of his moveset, but it doesn't tell me which move goes with which combination and so on. And I still need a Giga Mac on DK's boneset, for Giga Bowser. I'd do it myself, but I don't have a raw model available. If possible, Giga Mac will also need an HD texture.

The Nintendo Direct that Revealed Greninja showcases Little Mac' s Move set.
I've also played Little Mac at a Smash Fest.

Neutral B is Straight Lunge
Side B is the Jolt Haymaker
Up B Is the Rising Spinning Uppercut
Down B is a Counter

I cant really go in depth with the aerials and tilts, but the Nintendo direct will be a Great Help.

I don't know if anyone posted this already, but VGBootCamp made a video on Little Mac's full move set at the Smash Fest. It's off camera though
https://www.youtube.com/watch?v=uOyQEMCuam4