Looks like Bethesda has some competition in the "Large, Open world" rpg like game category. Red Dead Redemption was, if not a fantasy rpg, still excellent and now Two World's 2 appears to be http://www.neogaf.com/forum/showthread.php?t=409961
Hopefully with competition they'll be driven to make a yet better game :celebrate: But I digress, as we'll see an announcement between the beginning of next month and E3 of next year. Then we'll get the game between "Holiday's" next year and sometime 2012. Then we'll enjoy it when it comes out!
Oh, and trademarks have never been bought to "fool" anyone. They don't care how many conspiracy theories we come up with or even if we come up with definitive proof that the games being made. The marketing guys care about reaching the most people likely to buy the game in the most effective way they can. Right now that means a big announcement with usually less than a year until the game comes out.
I will say that there is a huge mountain of evidence that does show that companies will trademark names even if they never intend to use them. Oblivion has a movie trademark and it is meant so that a movie cannot be made using the name "Oblivion" unless it is so far removed in genre. It is entirely possible that an internet service provider could also at some point create a video game for use by customers online... meaning it is possible that Bethesda saw the potential for the name Skyrim to be used by the Florida based Wi-Fi company to produce a game and in order to protect their interests, simply applied for the trademark. This practice happens all the time.
While the above is entirely possible, and in many ways plausible, I personally feel that the Skyrim trademark will be used for the next installment in the series (even though I have always wanted a game in Summerset Isles).
And to further it all, the most we can believe is that there will be another TES game someday... everything else is guesswork and hope tied up nicely with coincidence and feigned perception!