Ron Charles has tweeted that a new Pynchon novel will be published by Penguin in Fall 2013. Entitled Bleeding Edge the work will not quite be out in time for International Pynchon Week 2013, but... wow.
Charles stated that two Penguin employees had confirmed the news to him and there's already a piece up about it at The Huffington Post.
Let the PYNCHON-L speculation begin!
(hat tip to Dave Monroe for pointing this out to me at a hectic time of moving house)