Seriously, I looked over the list of 5.1 improvements and the only one that intrigued me was related to battery usage, but there was no explanation of what was changed to improve battery life. So, I guess I'll wait for the JB, since there are some JB features far more valuable to me than the short list of "improvements" in 5.1. Does the JB crew have to start from scratch? Or is it possible a new JB version will be out in short order? Thanks!