by looks i think they will announce it later, probably late june for the new Nexus 7 (or henceforth name would change) and the new android version. Like how they did want to hold an event last year for Nexus 4, 10 and Android 4.2 but ended up cancelling the event due to bad weather. just don't lose hope, keep your heads up for more news, the i/o isn't over yet too. Let's see what they're going to do in the last keynote presentation.