No details yet, but at least I know my next computer will be a G5 iMac. What it looks like and what other attributes it has, one can only guess.
So I will. I think it will look similar to the new displays Apple has recently released (brushed metal), but the screen will still "float" above the CPU enclosure. I think the mid-range iMac will have a 20" LCD screen. The G5 clock speed will start at 1.8 GHz, and it will have both USB 2.0 and Firewire 800 ports. The internal HD will be 80 MB, and it will come with a paltry 128 MB of RAM. Airport and Bluetooth will be add-ons.
When I order mine, I'll likely get as much RAM as I can stand along with the Bluetooth add-on. I'll be tempted to get the wireless keyboard (which uses Bluetooth) and a wireless trackball or mouse. I might get an iSight, too, but only if my Dad gets one. I think he'd be the only one I would use it with (at least at first).