"The issue that happened with PSP is we got overrun with ports," Koller tells Gamasutra. "It became very difficult for us to define what made PSP unique. The content development became a bit unstructured or decentralized, in that we got a lot of content that was on PlayStation 2 and got thrown over to the handheld."
Sony is recommending publishers create unique content for the Vita, citing Ubisoft with Assassin's Creed 3: Liberation or Activision with Call of Duty: Black Ops Declassified, rather than ports.
"The messaging is similar [between PSP and PS Vita], but I think the output is going to be quite different," Koller says.
Sony PlayStation Portable PSP-2000