As expected, the questions were throwaway. At least the VIP guest appearances provided some levity (Colbert *lol*).
Most of the stuff was them as they shoot, basically like the vlogs. Finished footage was pretty much none, except that brief scene of Gandalf wandering through the crypt, which we have already seen parts of in the teaser for the first movie. Gotta say, quite liked the scene. Nice, eerie vibe, with that background noise. And Radagast was bearable.
So pretty much a vlog, which would be fine, but as "this big preview event" kinda underwhelming.