I am currently waiting for the Nexus 4 to hit the UK which is when I am ditching the 4S - The problem I have right now is the fact that I have been in the whole iPhone / iOS ecosystem since the very first one (started a lot earlier with iPods etc.) - I will be able to get around the DRM'd music (decrypt or simply burn to CD > rip again), but the amount of money I spend on apps is scary...
Really musn't think about it, otherwise I will be changing my mind and keep whining about things I hate with iOS 6 on my 4S