Yes, AF it's really a non-issuee, you can crank it up to 16x without losing a frame.
And if they can use SMAA as standard for AA and not those blur-fest that are FXAA/TXAA/MLAA, even better.
I'm not really hoping for MSAA, not more than 2X anyway, since it tanks FPS on every deferred engine.
But if it's really a bandwitdh problem, than maybe PS4 will be able to pull it off. I don't really know if it is so, though, on my PC MSAA in Max Payne 3 or Batman AC kills the framerate, and my GPU has a lot of bandwidth...
Maybe if forward rendering + becomes a standard... AMD seemed enthusiastic about it, basically they described it as best of both worlds.