AK and King play nothing alike, they only look similar and have a few shared moves. If anything Christie and Eddy should be combined back into one shared slot since they have next to no differences between them (as of Tekken 6, they'll probably still be pretty much the same in TTT2).
Baek and Wang could be gone, Baek I wouldn't like to see leave, but could live with it if Hwo got more of his moves.
tekken 7 is many years away. first they make ttt2, tekken x street fighter and smash bros wii u.
We won't see T7 anytime soon at all. It's so far away it's not even funny. We've got TTT2 console (which is pretty much done by now), Tekken x SF, and then that Smash Bro game for the Wii U they're doing before we get T7.
Even still, I still have no earthly idea of how they could evolve it...without pissing everyone off (a la T4 days).
"Azuma ninja!!" - Random guards in Tenchu series "Hahahahahahaha" - Mara Aramov