Namco has confirmed to Famitsu that its next-generation fighter - Soulcalibur IV - will remain running at a silky smooth 60 FPS no matter what. On the other hand, the team isn't sure if they'll be able to support 1080P resolutions, but it is being considered.
Personally, I'm not too worried about 1080P... if the game runs at 60 FPS then that is good enough for me. Solid framerates are very important in fighters.
Soulcalibur IV Will Remain at 60FPS [1UP]