I don't normally do this on a public forum, but let me put on my "analyst" hat for a moment...
My analysis indicates that these supply constraints are indicative of a Q1 launch of the next-gen iPhone. I predict that this model may be called iPhone5, with the "5" referring to the predicted (by me) 5-inch screen size. Please visit my website (and don't forget to click on the ads) for in-depth elaboration and pontification on my cursory analysis.