Edit: First question answered, read down a bit to the next edit.
I don't see a specific Playstation/Next-Gen Consoles sub-forum, therefore I'm asking here. Anyway, I want to know if the Playstation Store on the PS4 is connected with the Playstation Store from the PS3, for example; I've bought Borderlands 2, MGS2, Sonic 2, and a shitload of other smaller games on my PS3, and I wanted to buy Metal Gear Solid 3 to bide the time over a little bit until my PS4 comes, but I'm not going to do it if I have to pay for it again when the PS4 comes out (if I want it again), otherwise I'm just going to wait. I can't really find this answer online via google either or on the Playstation 4 website.
Thanks in advance for replies!
EDIT: Then I'll ask another question, the way that Gaikai is explained as making older Playstation Games streamable, but it doesn't say "some", or "most", or "all" Playstation games, It just says Playstation Games, I can't find an answer to this either - anyone know?