I don't expect much from it. I'm guessing it'll take at minimum at year to release from now, with a price of at least $300. Not only that you need a 650 graphics card which is decently pricey already. And the act of having to upgrade your computer or buying a new one is a hassle not many people will go through.
By the time it launch's, Vita will have a price drop. PS4 may come out, in which I expect gaikai to take its course and provide a competitive solution to the "stream steam games" problem sony may face.
Thats the way I see it.
PS+ has paid it's self for me. So from here on out I will refer to any new games as free.