It's not going to be RWD. You can't just make a car RWD if the current is FWD. There's a lot of changes that need to be made, and in some cases it's plain impossible. Engines are positioned in the bay according to what the drive wheels are, and most engine blocks are only made for a particular set of drive wheels.

As for the TSX being sporty, hell yes. Much sportier than the Accord, I'll say. The body is supposedly very rigid and the suspension tight. And the K24 will be fun I'm sure.

I think the Mazda 6 and TSX share many similarities. Of course I would give a hand (and wrist and forearm) up on the TSX.