FYI - this is not the full list. If you go to the URL at the end of this comments, it shows more sessions (like those for Google Glass): https://developers.google.com/events/io/sessions#all

I'm glad to see the list up, to get an idea of what the show will be about, but it's useless until the day-of anyway. They're going to announce sessions for whatever the keynote was about and people will have to reevaluate their options.

That's why I'd rather just look at what sessions are up at a particular hour and go to the most interesting (or wander the floor).

Wait - there's only one keynote this year?!

This makes sense to me. The keynote is for the most part a press event with product announcements. Journalists probably prefer to collect all the headlines in one event, and Google can focus on us developers for the rest of the conference.

Edit: If it was for me, Google would sell separate Tickets for the Keynote and the rest of the conference. This would make it easier for developers to get tickets.