In fact, WotC announced Fourth Edition at Gen Con 2007; something they had been denying up until that point. The 4E PHB, which was the first Fourth Edition product notwithstanding promos like the online magazine articles and preview books such as Worlds & Monsters, came out in June of 2008.
I seem to remember something funny with the timing....was it that at WinterCon they denied that 4E was coming out yet, and said that the next edition wouldn't be announced at Gen Con? Then they turned around and announced it at Gen Con a few months later?
that's what I remember....but I could be wrong. Something along those lines. At the time, given the buzz, I had thought WotC was going to announce 4E at Gen Con in 2007.....then they said at another show that they weren't going to announce it that year...then all of a sudden they did. That's what caught me off guard.
I remember thinking at the time that it almost felt like they'd had a bad quarter, sales were falling through the floor on 3E materials, and that management pushed them to announce the new edition early, and release it early. It felt rushed.
When 3E came out, there was a long, long playtest. One of the players in our group was even involved in it.....but he never told us until after the fact, due to the NDA. I guess he was only testing the new edition in a game he was playing with, in another group. 4E seemed to have such a short playtest period by comparison.
The truth will likely never come out.....this could all be baseless guessing....or it could be right on, but nobody will ever admit it due to legal reasons.
Banshee