Aside from the buttons and tagging in mid air combo, the game is pretty far from Tatsu. From what I've read of the build shown at Chicago, it's pretty much "Mahvel" with very strong keepaway and lockdown. Trying to play it like Tatsu is a sure way to get killed.
That said, GG players should definitely give it a spin. Word on the street is that Trish (arguably the best character in the recent builds) plays like Testament.