For now, I only know that there's going to be at least 60 words in the Draconic vocabulary, which comprise 20 dragon shouts in total, each with three tiers of progression. Now, of these twenty, I'm only fully sure about two - the oft-discussed ability to slow time and the force-blasty-thingy from the teaser, when the Coverboy yells something at the dragon (which in its language probably means 'I love kittens!' or whatever, but we'll probably never know), and there's 'booh!', 'whoosh!', blue-light-VFX... and the camera flies away.
So... are these the only ones revealed so far, or have I missed something? I know there are many speculations and ideas, but for now my voracious curiosity shall be happy to settle for just the shouts officially announced and supported with a source.