Oooh, i really like the voxel shock trooper and the voxel sniper. Those would be great models for the players in AoS as an alternative to the bland default ones. :D
Regarding sound:
I really like the atmosphere the current sounds create. Especially on close quarter tow matches. It feels very immersive and has a quite realistic touch to it, which is one of the main reasons i enjoy the game. I think futuristic laser weapon sounds or something along those lines would really destroy one of the key elements of the game i like.