http://kotaku.com/389162/call-of-duty-5-already-playable THERE IS A wii AND PS2 VERSION AS WELL

Keep in mind that playable absolutely does not mean anywhere near finished. It only means they can play the game from beginning to end without having to use any warp triggers or little cheats.

Wow, it's going to be set into the pacific. That is new.

yea killzone 2 was playable last year and look at us still a year away i hope its out by xmas tho :)

yep - playable can still mean a while to wait

Medal of Honor: Pacific Assault wasn't half bad. I don't expect CoD5 to be any better, though.

wow already, cant wait for the wii version, but i hope it will have better controls than COD3 wii

 Most likely the same as other games. PS2/wii version 360/ps3/pc version.

 3rd party developemnt works on a lowest common denominator structure.  This means that for PS2/PSP/Wii development, the art assets will first be developed for the weakest system (PSP) and then ported over to PS2/Wii or from PS2 to Wii if no PSP version is in development.   This ensures it runs on all versions, saves money (because art is the most expensive part of game development), saves time, and ensures a similar experince across all platforms.

Taken up to X360 and PS3, same rules apply.  They'll plan the art assets to ensure they work largely equally on both platfor, develop them on one console and port to the other.

Art assests from X360/PS3 to Wii/PS2 are almost never shared because the texture resolutions are too high.