It shows off:

• where it takes place (ancient Orr)
• that that place is mostly a wilderness (as the game takes place a thousand years before the first one)
• some playable races (Kodan bears are new, Asura and humans are not, Charr won't be in this one due to the time period)
• different mount types (flying dragon is probably a mount too)
• different modes of movement, which is a large focus of this game
• gliders
• the style they're going for, evolved from GW2

And I've probably missed a ton of things. Once you really start looking at it there's actually a lot going on.

Yeah aside from the mounts this looked like some generic unreal engine demo using generic assets.They’d be better off just showing the logo until they have some actual content to show.

Kinda par for the course for guild wars PR though. GW2 had some weirdly bad promo videos.

What do you mean by headline? A headline is usually accompanied by an article but as you said there isn't any extra details beyond the major announcement of the game existing.