I'm surprised he hasn't leaked anything by now. Hell, I just want Zenimax to trademark another title that sounds like it could be a DLC. Nice avatar

That's already happened. They TM'd the term "Dragonborn" around the same time as "Fus Ro Dah."
That's not surprising. What is surprising is that its description matches only TWO other TMs for Skyrim. The first is Dawnguard, the other, Hearthfire. Fus Ro Dah has a similar TM, but specifies that it is for ringtones, pictures, etc.
Dragonborn is specified to be downloadable software for both PC and console. This is public info, but not many people actually listened to the articles referring to it. I only found it by chance a few days ago.
Take all of this as you will.