The good news is that we'll someday know if this guy's full of bull or not -- he says that the optional boss in Ulduar will be vehicle-based, and that part of the raid will deal with the boss, while the other part of the raid runs around destroying parts of the environment in vehicles. He also says there's a whole new Azjol-Nerub zone going into the game in patch 3.2, and that the next expansion will likely focus on the Maelstrom and Caverns of Time, which will send us back in time and have Sargeras and Azshara as the main baddies. This could all be complete and total boloney (most of those things have already been rumored before), but at least it's stuff we can verify in the future.
The rest of his insights could just be made up, and unfortunately, he says some unkind things about a few other developers that Blizzard would probably frown upon if they were true. So take this with a metric ton of salt -- I looked around the Something Awful Ask/Tell forums to see if that's where this was originally posted, but didn't find anything, and WotLK Wiki didn't share a source at all, either. But we do have to agree with one of their sentiments: it would be nice if Blizzard was this forthcoming with some of their official outlets.