True, but, according to the first post, this is speculation about the release date, nothing else.
But just to satiate your speculatin' mind... one of the interviews said that they were rebuilding the gamebryo engine for the next big game. Since most of us assume that's TESV, we can also assume that the engine will be a newly refurbished Gambryo one.
I REALLY hate to side with Potter on this one, and I don't, but just to be the Devil's advocate...
If we were just posting about the release date there wouldn't be 77 threads. Just saying, there has been a lot more than just talk about the release date. We can barely stay on topic for a page without a mod giving us a dirty look, the off-topicness keeps this thread alive. Additionally, I can see how the thread's name could confuse people. If people want to talk about TESV and they stumble upon the "Official TESV Speculation Thread" they will post here and read the rules later. I think we've all made that mistake before. :/