I figured this might happen. Knowing what I know about Apple's development teams, they are incredibly flexible, and individual members can be switched from one product to another as needs arise. Also, there were, prior to the iPhone introduction, 3 development teams: One handling fixes to the current generation of Mac OS, one developing the next Mac OS, and one handling all the other things that run on Mac OS that Apple sells (Final Cut, iTunes, etc. - since all these products rarely get updated all at once, one team handles them all). With the iPhone, iPod touch and iPad, 6 new teams were introduced: 2 per device. These 6 teams collaborate frequently to make sure a baseline feature set is maintained for each device-specific OS release.
Anyway, that said... Apple obviously wishes to focus on iPhone OS 4, and since their 9-team system is so flexible they can take developers away from other teams to help the iPhone teams out.