Well I hope they give soon us a new Spoiler or something to be hyped about for the next expansion , so we can start guessing on more solid arguments than just a registered trademark ...
For what I posted befoure I woudl be even satified if they just add SPEARS!!!
I can think of so many times that a company trademarked a word or phrase from their games, and every single time it was either an expansion, or new game. The trademarks really are almost a 100% guarantee of new content, especially if the name is related to a past release or series (and the trademarks always being for something relating to games, downloadable games, etc guarantees that it will be a game).
Hearthfire is a
month in the Elder Scrolls universe, and I were a betting man I'd bet you one-hundred dollars that Hearthfire is going to be some new content for Skyrim.
If you start to pay attention to games and expansions releases, you'll notice that trademarks are just about the safest way to foretell the announcement of an upcoming game, or an update for it.