Here's a few things I predict will happen:
A. Both Mac Mini and iBook will be updated to Core Image compliant graphics, I say 64MB 9600's, just because that is what was placed on the eMac, and those machines are all in the same sub-class if Apple's consumer line.
B. The iBook will get bumped to standard Bluetooth and 1.33/1.5 configs, as the next PB update will boost the 12" PB to higher clock speeds anyway. The Mac mini will get the same treatment, bumped to 1.33/1.5, and will likely get standard bluetooth and AE.
C. I think we'll probably see a standard SD on the high end Mac Mini model, and no SD on any iBooks, except as a BTO option. That is unless Apple does a complete surprise and puts it in the 1299 model, which of course would be awesome.
D. The iBook will most likely go to a 12" and 13.3" models, the latter sacrificing a bit of screen real-estate for a WS display and higher resolution. This is only if the WS rumors are true, which I am about 80% on right now.
But I guess we'll see! I am hoping to see a 1.67 Mac Mini, as I want to buy one, but seriously doubt Apple would put that in one of these machines. Only time will tell though...