When asked what he was working on, WotC's Chris Perkins revealed a couple of juicy tidbits.  They're not much, but they're certainly tantalizing.  Initially, he said that "Our marketing team has a big reveal in the works", and followed that up separately with "Right now I'm working on the next seven years of D&D stories".  What all that might mean is anybody's guess, but it sounds like there are plans for D&D stretching into the foreseeable future!  Thanks to Barantor for the scoop!