I hate the secrets, but if it is true that Bethesda has a project in full production right now that is behind the closed curtain, it has to be TESV. Only viable option for a company that... you know.. wants to make money..
But I think they're drawing it out too much. I barely even care, just kind of getting pissed they think so little of their fans that they won't even throw them the smallest bone. This is one of the best series ever, a one-of-a-kind product that the fans flock to and devour, not even leaving the bones. It's been a few years now, is it really so unfair to ask for a confirmation that they even PLAN on making the next one? Even that is speculation. We don't even know if they want to make the next one, we're only assuming (rightfully so, just saying)
That being said, I believe the next one will come out 2011, with a DVD of the production team talking about how fun it was keeping it secret for 5 years and checking these threads on the fan forum.
Erm, Bethesda's last release was less than two years ago. They will announce the game when they have something to show, and not before then.
It's amazing to me the sense of entitlement that seems to run rampant in this thread. Bethesda doesn't
owe us anything. They do things on their own schedule, and they do what they must to properly run a company. If you want a new game out every year, pick up on an EA franchise. Be patient people, sheesh.