It looks like Eat Sleep Play's new Twisted Metal: Head-On PS2 title will be more than just a PSP title with better graphics. It will be a PSP title with better graphics and plenty of extras (on top of the documentary that's been announced). From Jaffe himself:
...it seems like we're gonna get some great fan videos coming in, so that- along with tons of old concept art, toys, video, and other behind the scenes stuff we've uncovered- should make for a good package! I'm jazzed!
I'm jazzed too, Jaffe. I'm jazzed too.