I have recently bought a Rev B iMac 20".
I will replace my machine, when the following iMac is released:
24" viewing area minimum
1/2 inch thick
Nothing below the screen (i.e. the bit with the logo won't be there)
Wall mountable
Built-in TV tuner
s (watch & record different channels at the same time)
Full media centre capabilities
Bluetooth remote
Intel (obviously)
I think that will take at least 4 years, which gives my current machine a good lifespan.
5 years ago I would never have believed that there would be a machine as beautiful as the iMac G5. And today most people don't believe that there will be an even more jawdropping machine in 5 years time. But there will be.
23" minimum.