I suspect Duke is one of the reasons for the complete lack of E3 related announcements so far this year. That and their own Portal 2. They'll not want a "coming next year" annoucement about E3 to be wasted by it being overshadowed by the big things being released in the next few months. Hopefully there will be an announcement later in the year, during one of the release dry spells.

Though you could be right, we've already been waiting for E3 twice as long as E2.