I’ve seen it, and the really only new thing was the perk tree.
For anyone who hasn’t seen it or just doesn’t know, the way it works is your selection of perks is available based on your SPECIAL stats, kind of like in 3/NV. The difference is these perks also control skills, i.e. skills are no longer available. Right now, I’m okay with it, because it was insanely easy to max out a single skill over the course of a couple levels. In New Vegas, for example, I could use every gun before level 10. This seems to fix the issue, but we won’t know until release.
I saw it and it honestly wasn’t anything special at all. The perk tree looks cool, but you can barely see it (along with everything else in the video). Everything is just so… blurry and out of focus. Either that some shoulders are blocking the view. I’m sure Bethesda will put their nice, high-quality version of it up soon anyways.