During the Develop conference (via Eurogamer), Sony Europe R&D manager Phil Rogers outlined some possible interactions between the PlayStation Vita and the PS3. The systems are already known to share saves across compatible games, and share some interoperable games like Wipeout 2048, but Rogers discussed some other capabilities, including some not yet seen in Vita/PS3 interaction.
"PS3 can send data down to Vita and Vita can display it," he said. "You could use the unique features [of Vita] - gyroscope, touch front and back - as a control device for a PS3 game." In what could be a veiled dig at the Wii U, he also said that because you can have games running on both systems, each using its own processor, "You're not sacrificing the PS3's CPU to be able to have a rich experience on Vita."
At launch, the Vita will have some cross-platform features, including scoreboards and PSN user data. "For launch we'll also have Remote Play, which does look good on Vita - I saw an early version of it running recently." Remote Play, also available on the PSP right now, allows video of compatible titles to be streamed from the PS3 for play on the PSP. Continuation Play, through which a game can be saved on one platform and played on the other, will also be available early on. The first known game to use that is Ruin.