I can't wait! My G5 iMac has officially died and gone to that big computer desk in the sky. It served me well for 5 years, but it's over. Darn thang won't even turn on anymore. I hear the apple start up chime, but the screen stays black and then the iMac just shuts off. But even if I could fix it, it's so old it can't run the latest OSX or even play HD movies. Yup...it's time to buy a new iMac.
I'm hoping that the next update sees i7s across the line...even the 21.5" models. I expect thunderbolt too since the MacBook pros got it. Other things on my wish list would be for them to include that rumored flash start up drive as standard....but I'm not holding my breath. It would be great if the 21.5" model got the same ability as the 27" to be used as an external monitor. That way in 5 years or more when it becomes unable to run the latest software, you can still use it as a second monitor.
I like the 27" features, it's just a tad too big. Actually the rumor about Apple adding a 24" size back to the iMac lineup would be PERFECT. But again...not gonna count on it.