For some reason, I didn't see this at the DnD website, but the DnD Youtube Channel has two new videos about the Sundering books. Not much new, but they're worth the quick watch.
(fwiw, I wonder about when the conference footage was filmed. It pretty much has to be recent, because it has the most recent artwork for each of the characters plastered on the walls!)
Now, if you'll excuse me, I'm off to go read The Companions. ;)