Well I say that, if Apple does not take advantage of Santa Rosa right away, then the next IMac will be here around the Paris Expo in September. I Also I say that if the IPhone is pushed back, even if by a couple of weeks, we will not see Leopard till Macworld 08, in January, with a redesigned IMac around the same time.
The IPod is due for a update, with a small bump last time, Apple will not let that market wait, so that will take more resources away from the redesign of their computer line.
I am not putting down Apple, they just have a lot of things on their plate right now and when they do come back to there computer line they will do it right. Remember the Tom Petty song "The waiting is the hardest part" how true it is.