"Once you connect to [Resistance 2], Resistance: Retribution becomes 'Infected,'" exclaims a presentation slide from the Tokyo Game Show appearing on the PlayStation Blog. The Infected version of Retribution grants an alternate storyline, health regeneration, underwater breathing, and weapons borrowed from the PS3 game.
While connected to a PS3, Retribution will also support the DualShock 3 controller. With the console controller, auto-aim is turned off and the difficulty is ramped up while vibration support is enabled. Players can also use the PSP-2000 and 3000's video output feature to replicate a traditional console experience.
On an aside, seven new screenshots for Retribution were released, which can be found on Shacknews. The portable shooter is still on track for a spring 2009 release.