
Every new model (g3,g4,g5) of the iMac has been completely different than the one before it. So I expect that todays announcement will be as equally radical.
Personally I liked the looks of the g4 (the one that looked like a desk lamp, who else but Apple could make something like that a cool thing?). The first Mac I ever owned was the G5 iMac, I still use it daily and love it. It is very good at looking good without getting in the way (either physically, because is has a small footprint, or aesthetically because of its minimalistic design).
One of the best things about being an apple-fan are these hyped-up new product Events that Jobs gives. Its remenisant of the excitement christmas or birthdays used to bring when I was a child. Obviously, I'm eagerly awaiting for today's Media Event to start to see what cool new "toys" Apple has in store for us.