Just like with the PSN network issue, Sony could give people PSP/PSN games free of charge. There's plenty of titles to choose from and you don't have to do anything to get them to play on the Vita meaning Sony wouldn't have to dish out any additional cash. Or they could even to a voucher to an upcoming game (which I would rather have myself).
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Hard to say about upcoming exclusives but I imagine there's going be the expected games like God Of War something or other, Gran Turismo, Little Big Planet, ect.
There's plenty of director cut ports, which is basically the same as Legend of Zelda OoT 3D, like Persona 4 the Golden, Tales of Innocence R, or Monster hunter p3.
And lastly does exclusive matter? Vita recieving tons of ports, some with additional content like Street Fighter X Tekken, Mortal Kombat, Ninja Gaiden, Rayman, ect.
A few games that I'm interested in are a few cult hitters like the next Little King Story and valkyria chronicles 3 (which was an PSP game that never released stateside due to high-piracy rate).