SSX was the only game I really played from the PS2 launch ... still stands up as one of my favorites. SSX for PS3/360 is definitely coming, but it's pretty far down the pipe from what my friend at EA tells me (and could/probably will slip).
EA is almost completely platform agnostic, though now that the Wii is out it kind of demands different versions of games with the different controls and last-gen graphics. You can't just port a game that pushes the 360 and PS3's capabilities to the Wii. So, like of the the PSP ports, I think you'll find stripped down versions of games on the Wii with the same or similar name as releases on the two main systems.