Predicting the Next Mac Desktops

Marco Arment speculates on the answers to the questions everyone is asking:

Why did Apple just release new MacBook Airs, MacBook Pros, and a Retina MacBook Pro, but no new iMacs or Mac Pros? And why are the iMacs probably being updated this year while the Mac Pro update won’t happen for 12–18 months?

I think everyone wants a ridiculously high-resolution 27″ display, but as Arment notes, it requires more bandwidth than is currently available from any display connector.