What do I think?
Either a) this will not happen at ALL, or b) There will be some slight changes
On the iPod mini and photo series,which are running in tight supply (5-7 biz day wait for an iPod mini, 2-4 biz days for an iPod photo), something has to happen.
Both the 20GB and 40GB iPod models are still in plentiful supply. There is, however, a definite chance the 40GB monochrome iPod could be dropped.
Who knows? Maybe even a 20GB photo with a 15 hour battery life.
The U2 special edition could stay around for a while longer, but I won't be suprised if that ends up getting updated.
The remaining stock of Gold iPod minis could be sold at clearance prices ($179, maybe) to clear out the stock (BTW, who owns a gold iPod mini? I sure dont).
But most likely, the 4G iPod is here to stay 'til early 06. Well, maybe not.
This is just my speculation. No guarantees.