I have to say that Bethesda is kinda disappointing recently. The idea that they can leave fans languishing for years while Bioware dominates the RPG market kinda worries me.
Oblivion wasn't announced until over two years after Morrowind was released. It hasn't even been two years since Fallout 3's release.
They're focusing too much on what they're publishing instead of talking about what they're developing. It was at last year's Quakecon that Todd Howard said there wouldn't be another Elder Scrolls (but Pete Hines said there would), so announcing it there this year would be a cool way to make up for it.
Expanding Bethesda's publishing arm isn't done at the expense of the developers - and in fact it helps maintain Bethesda's independence from large publishers like Activision and EA.
Bethesda Game Studios was also recently expanded so they could work on Fallout 3 and Oblivion at the same time so it's not like one side has been growing while the other side has languished.
The moral is that Bethesda trumpeting about Doom 4, Brink and New Vegas instead of TES V is comparable to Rockstar making a big deal about LA Noir and Max Payne instead of GTA V. The flagship franchises are what people want to know about most, Bioware gets this, but I don't think Bethesda does.
Bethesda doen't unveil games until they feel that they have a substantial amount of information to release, and if possible they don't announce a game until they are ready to unveil it. There are advantages and disadvantages to this but it is how they've done things since TES III shipped.
I don't think its woth speculating on trademarks anymore.
Here here!
Trademarks can be a good way to get a clue about what's going on but they can't be considered in any depth because we simply don't have sufficient information to do this. Beyond the initial Skyrim registration I'd argue we've learned nothing of value from tracking these things.