Unsurprisingly, they talked a lot about the combat, and there was really nothing new. It was mentioned that they were debuting a new city that had been built out of an aircraft carrier, or something, but it didn't really go beyond showing a few images of it.
They did go into Bethesda's history, as a developer, bringing up early Elder Scrolls games and the Terminator-licensed games. I'm pretty sure they didn't really go into the history of Fallout.
Yeah, it was more of a commercial than an informative preview.