Google I/O may still be a solid month away, but folks on Mountain View's social network are already stumbling across leaks and notifications hinting at what might be in store. Google Play's 4.0 redesign, for instance, briefly appeared on a YouTube employee's profile before being deleted, matching the holo-themed leak we saw last month. The update shows a landing page we didn't see in the previous walkthrough, and includes a message introducing the redesign that promises