I'm wondering about the two-year or similar contracts people signed when they purchased or obtained for free a 3GS? Perhaps there's a corner case when someone got a 3GS + 2 year contract just five months ago. Might be some backlash if the device they planned to use for the next 19 months couldn't be upgraded to the latest iOS. Note this isn't an issue with iPod Touch or iPad due to lack of contracts (except perhaps an iPad data contract? But I'm under the impression those are more flexible, month-to-month etc).