I doubt nVidia stopped working on the post-Fermi generation(s) of cards just because of the delay. We could be looking at a short generation, perhaps? Edit: Maybe I should read your entire post before replying :o
I think it's interesting because of what it didn't show, you know, like, real games. Also, the two examples of 3D surround that I have seen don't show the game in real action, just "sitting still". Edit: Nevermind that, 3d vision surround seems to be alive and kicking :)
I had a 8800gts 320 before I got my 5850, and yes, 5850s are just louder. Changing the fan speed curve with MSI Afterburner made it bearable. A 5970 would be about twice as fast as a 5850 assuming it actually works with your game.