This is just a wild guess, but I think the 997 Cab and Turbo will follow a year or so after the intro of the 997. Personally I think the 997 will be a widebody all the way, maybe with different suspension for "S" and stuff like that.

I just don't know how much of the 996 internals will be on the 997. If it's just a skin change with existing motor/drivetrain they could all come out together.

Who knows what PAG is thinking. Worse thing you could do is use logic! (sorry PAG)