My quick idea is that he gains slightly more damage on his normals and gets a new special that only works in V Trigger mode. But his mobility, normals, specials aren't enhanced. So he can't walk faster like Birdie, charge his fireball like Ryu, or get torpedo himself full screen like Cammy. The damage potential would be crazy good, but he has to get it honestly the way Ryu does now.
Speaking of that though, I do hope they add a new mechanic to the the 2017 balance update. It doesn't have to be multiple critical arts or V Trigger but I'd like to see something new to change things up.