So lets see most the updates to the hub have been videos. Well past the initial few that gave us the story and the dragon language game decipher thingy.
They talked with Todd Howard who gave a tour of their studio and their past, revealed the map and some concept art
They talked with Todd Howard about basically his past and video games in general, revealed some tidbits of information
They talked with Mark Lampert about the sounds and audio in the game, revealed the new theme, centurion spheres, dragon shouts, and other info.
I imagine it will be yet another video(s) with someone when they visited their studios. It won't be about the sound/audio so it'll either have to be something else about the process of game design or just some screenshots and footage?
I think a likely thing they could explain is the new engine and it's capabilities. Showcasing the world in game. Like the weather, snow falling, wind, plants etc. It wouldn't reveal too much of the game and it would stick with their trend of revealing things about the game but not actual gameplay or too much info.
I hope for more concept art from the walls at their studios or maybe a screenshot or two thrown in there.