The PS Vita uses, among other things, a cross-play feature, which means you only have to buy a game once to be able to use it on both the PS3 and the PS Vita.
To top it all off, Sony has now confirmed that all DLC content will also be free to use. Additional content for MotorStorm RC, Hustle Kings, Top Darts, and WipEout 2048 only needs to be purchased once. The same applies to Ultimate Marvel vs. Capcom 3.
The 'Fury' expansion pack for WipEout 2048 will also be released in the spring; of course, it will be free if you have already bought it on PS3.
Source: PlayStation Blog
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