There is no single day anniversary for D&D. The whole year is the anniversary, and a summer release, targeted for GenCon is perfectly in keeping with WotC's usual edition release schedule.
"Sorry I missed our anniversary honey. But, if you think about it, this whole year is our tenth anniversary."
Yeah, don't buy that.
Okay, I *would* if WotC were doing a big "this whole year is our fourtieth!!" celebration. But they're not. They had one half-assed article on January 21st, where they put out a call for videos and then updated it twice before giving up.
They didn't change their website, they haven't released a retrospective book like during the 30th.
They do more for a single Drizzt book release then they did for the 40th.
So, no, the whole year is not the anniversary because they're not acting like the whole year is the anniversary. They're pretening the anniversary is in the summer, missing it by six months, and wasting half of the anniversary year in silence.
Not at all. Work on the 1989 2nd Edition began in earnest in August 1987, when they sent out a questionnaire in Dragon magazine. Work on 3rd edition began in late 1997 for a 2000 release. Work on 4e began in mid-2005 for a summer 2008 release. Work began on 5e in mid-2011 for a 2014 release. Roughly 3 years is a perfectly standard length of time to work on an edition, particularly the "completely new game" version of editions that WotC favors.
Right. And your argument was that they were always going to do something for the 40th. So if that was always their plan they should have known it was going to take three years and started eight months earlier, releasing for the holidays 2013 and hyping all of 2014 rather than just half.
But they didn't.
Which implies they were hoping 4e would still be going strong during 2014 and they'd be able to start a shorter revision in 2012 or 2013 for release on the anniversary.