User blog comment:Lord Loss/Monster Hunter Portable 3rd on the PS3/@comment-3095304-20110619230043/@comment-1758220-20110628161308

We don't know if it will actually be available for the Vita, but there are videos of it being used to demo the system's backwards-compatibility capabilities. It utilizes the 2nd analog stick for camera control, and you can presumably swap that to the attack commands if you want. It was likely just a demo, but in a perfect world, it would be released as a Vita downloadable launch title.