This is the first time in a number of years I have not participated in the pre-release beta testing for Photoshop, and I must say it is strange to be out of the loop and unconstrained by an NDA.  One thing I know for certain is that Adobe works on 18-24 month product cycles, and CS4 is just about to hit the 18 month mark.  In my humble opinion its lunacy to have such a short product cycle as the consumer barely has time to adopt and learn the updated program before it is depreciated by the next product cycle, but, that being said – everybody gear up for the next life change from Adobe!