http://www.gottabemobile.com/2013/05/16/android-4-3-white-nexus-4-rumored/ Makes total sense. Google I/O is technically a developer conference. Google was trying to address core Android problems, mainly fragmentation. They're also giving developers more tools which in turn benefit users. Everyone knows Android 4.3 is out there, Google even leaked it themselves. Google has an interesting strategy. Have Google I/O first, then release a bunch of tools for developers and address fragmentation. Then have a more silent update on the same day as WWDC and announce Android 4.3.