A tidal wave just crashed into the 40k community in the form of a new rumor by previously reliable source from 40k Radio, that rumor being that a 7th edition is on it's way summer of 2014, only 2 years after the release of 6th edition. I personally can hardly believe it, and there has been an uproar across the 40k community despite things telling us that it is likely just a 6th edition book updated with Escalation, Stronghold, and FAQs/Errata. Only time will tell if this turns out to be true, but 40k radio has been extremely accurate during previous releases. As to the confirmation by an anonymous source from Faeit, it's anonymous so take a double serving of salt.
Warhammer 40k Rumors
Warhammer 40,000 7th Edition
via 40k Radio Facebook
via an anonymous source on Faeit 212 (solid source)
The next edition of 40k will be called 7th, not 6.5 when it drops, but as far as rules go it will be less of a jump than 5th to 6th.
The key areas being updated:
Interceptor, sky fire, fortifications, lords of war, allies and data slates.
As for its release it'll probably be September not "the summer."
It's not finished yet, still being tested so anything can happen.
The thought behind this edition is to make the game less alpha strike explosive and more "competitive" at all points values (even when including Lords of War), but D weapons outside of apocalypse may see alternate rules.
Pistols in close combat in 7th