EA announced they've currently got no plans to release a PS3 version of Command & Conquer: Red Alert 3. Apparently, the console is "very exotic and tough to develop for," and their game engine is simply not suited for PS3.
The game was initially announced for release on PC, 360 and PS3 platforms, but the PS3 version was apparently on hold for these reasons.
Still, there's a glimmer of hope as they also said that they might come back and do something with PS3 in the future, although it sounds more like a promise to temporarily soothe the burn.