I would say an original spinoff, with RE4 controls and camera, is most likely. The textures would be closer to the GC version, as the system has texture compression, and hardware based textures don't eat up a lot of battery life anyway (as screencaps and video of FFVII: Crisis Core show), but polygon count and framerate would be at typical low PSP levels, as those do eat up battery life.
That is, unless Capcom packs in a super longer battery with the game (even greater than the gold battery, which only adds 20% to battery life), so that the game would have an advanced graphics options, so that the graphics would be closer to 6th gen home systems.
And there would be loading as long as the PS2 version, but even the PS2 version was pretty good about it, and reviving the cool creaking loading door would be great.
A flashy-first game is awesome when it comes out. A great-first game is awesome forever.
Plus, just for the hell of it: Kelly Brook at the 2008 BAFTAs
