First, thanks to +Jason Paul McCartan for pointing this out.
Legacy of the Crystal Shard: Sundering Adventure 2 (D&D Adventure) [Hardcover] is releasing on October 15th, 2013. Jason also has info that Murder in Baldur's Gate: Sundering Adventure 1 (D&D Adventure) [Hardcover] is planned for August 2013. Still, if we are getting new adventures, you can bet a bucket of dice we are getting a new edition of the game.
It would make sense.
D&D Next has been in the works for about 2 years now, was announced a year ago to the public and went into Beta shortly thereafter.
Gen Con 2013 release looks good, and with the good will and profits from the release of legacy editions of D&D on the OneBookShelf series of webstore in PDF, I expect this will be a very strong year for WotC.
Next might not be my game to play, but I suspect it will do better overall than 4e did.
Of course, time will tell.