Mine seemed to be pretty hot when it was downloading all my apps this morning. I'm not sure if thats different though, I've had a case on my 4 since day one.
None here, I only have around 1000 pictures in there though so its not a huge library. Its a little slower adding photos than Lightroom but I prefer the interface in Aperture.
Hulu would be incredible. I'd love to see a App Store for it but I'm sure there would be a announcement about that.
I'll probably wait until 4.3 is JB'd so I can keep XBMC.
Do you have any movies on your computer that you wish you could watch on your TV? Ever wish you could watch youtube on your TV?
Those are the main things I use my aTV for, I have a 360 as well.
I think I'm going to pass as well. Unless it gets some killer feature with iOS5 that the original iPad won't get I personally don't have a reason to upgrade.