I'm fairly sure WW/VC will, given Nintendo's insistence on (close to) perfect backwards compatibility and emulation, and the precedent set by DSi -> 3DS. The graphics card in my Wii's cooked it so I desperately hope this is the case.
Given the rumours about Sony I'm not confident at all that my PSN games will carry over. If so I won't be in any hurry to buy a PS4. There are still plenty of games I haven't played on PS3.
In all honesty I'm planning to go Wii U/iOS/new Macbook/3DS for next gen. I don't really play my PS3 enough to justify owning two consoles, and I couldn't give less of a shit about raw powah.