Apple will move to a single CDMA/GSM chip if possible - it's just a matter of time.
If they can get it in for iPhone 5 and keep a similar size/weight and price then they will. If they can't - then they will wait for the next revision.
I'm actually a little surprised if they update the iPad to something less than 2x resolution.
But I guess now they have the clout to do something less than convenient for developers.
Word is the Verizon iPhone 4 is the first of this with the CDMA side turned on and the GSM end totally castrated in production.
I bet we will see this iPhone 4G as a multi-mode phone with options to sell it via "pay as you go" plans. Virgin Mobile and Metro PCS has been wanting the iPhone for a long time. The app to track your expenses will be awesome!