It might not exactly be trash, folks. There's a chance that it's true, but it was put on hold or went slower than this 'Chris Hartgraves' was expecting. I went to wastelandgames.com and searched for Chris Hartgraves but couldn't find anything as definately proving he's real and worked for Blizzard. Only Blizzard Employees or HR could tell us for sure (Unless we find Chris Hartgraves).
That alone doesn't disprove this, but judging the March 2005 date on the post, as well as the rather poor typing in the quotes of 'Chris Hartgraves' makes me doubt it, especially since we'd have news of D3 if it really did show up at Blizzcon.
Nevertheless there's still a chance that 'Chris Hartgraves' is real, and did work for Blizzard, and is indeed quoted (and quoted accurately) at that site. If that is so, then D3 may indeed be under production. Of course, don't believe everything you see on TV, so don't get your hopes too high from this.