At Gamescom in Cologne, Germany today Sony announced a new initiative that will give PS3 players an incentive to buy: free games for the Vita. Dubbed the "Cross Buy initiative," players who buy a PS3 game in this program will get the PS Vita counterpart game for free.
For example, gamers who buy the PlayStation All-Stars: Battle Royale will get the PlayStation Vita version free. Sony also announced that Sly Cooper: Thieves in Time and Ratchet & Clank: Full Frontal Assault will be part of the initiative.
The "Cross Buy initiative" will certainly help move PS3 sales because players like free stuff. We hope Sony will extend this to a number of their new titles moving forward, and hopefully third-party publishers will get involved too at some point.
More details when we have them.