If you're not in the loop, Monte Cook has been brought back aboard in some capacity for design work at Wizards of the Coast. Many (myself included) consider this a good thing. Rule of Three addresses some of the questions about what this means (and what Monte is doing) here.
I'm pretty comfortable now betting on a 5th edition of some sort in 2014, although if we don't see some talk of an open playtest by the end of next year then I might revise that estimate again.
UPDATE: Monte's first Legends & Lore column is up here. Reactions have been....interesting, to put it mildly. Myself....I think I'll wait until I see a couple more culmns from Monte before assuming he's too out of touch with the current audience for D&D, but it does sort of feel like that.