As somebody who spent 30 hours on DOAX, I will be buying this.
At least being on PSP will mean a relative lack of the awful use of DLC this would certainly see on consoles.
The question is: 30fps or 60fps?
Well, the XBOX360 version of DOAX2 was 30 fps, so I can't imagine a portable version being 60.
are there any PSP games that run at 60fps?
also, tecmo isn't reliable for a solid 60fps like they were last gen.
Quite a few, actually.
In addition to the games listed by Prole you have (not counting 2D games just those that use 3D elements). Off the top of my head...
Maverick Hunter X, Megaman Powered Up, Exit 1 & 2, Super Stardust Portable, Gran Turismo, LocoRoco (all three), N+, and Virtua Tennis. I'm sure there are more, but I probably haven't played them. The Namco games are definitely the most impressive, though. Soul Calibur looks stupidly good for a PSP game. Hard to believe they could pull of those visuals at 60 fps on a handheld.
Shame their efforts on iPhone have been poor thus far. Ridge Racers at 15 fps??? No thanks!