Other than the [url=http://www.bungie.net/en/Forum/Post?id=64640187]Super Bar[/url], which got its own post, there were a few new HUD elements in this video.
First, notice the [url=http://i.imgur.com/kAVBukg.jpg]icons[/url] next to the ammo counts. Possibly indicating different ammo types or modifiers.
[url=http://i.imgur.com/NCnZLkP.jpg]Here[/url], we see the Ghost icon. It appears whenever the ghost is talking, and could potentially indicate that there's something the ghost can do.
While the player is deploying the Ghost, we see several HUD elements appear. First the [url=http://i.imgur.com/bd0oJZM.jpg]current objective[/url]. While not strictly a new element, it's much more visible in this video. We also see our [url=http://i.imgur.com/NA9WeZY.jpg]current location[/url]. This element is temporary, and goes away after a moment.
In this same scene we also have some [url=http://i.imgur.com/tfHnK7S.jpg]button options[/url]. Triangle apparently brings us back to orbit. I'm guessing square was used to deploy the ghost, but is also mapped to something else, which cannot be summoned in this location. What might that something be? We find out a moment later when the button label changes: [url=http://i.imgur.com/1rDBuLq.jpg]A vehicle[/url].
We also get a nice view of the [url=http://i.imgur.com/HoQFbJY.jpg]waypoint indicator[/url].
Here's the [url=http://i.imgur.com/aorHl5w.jpg]full scene[/url] for those interested.
And another image that includes the [url=http://i.imgur.com/LtZZG6b.jpg]waypoint indicator[/url].
Here, notice the [url=http://i.imgur.com/QYPhGNY.jpg]radar[/url] doesn't display enemies as discrete points. Rather it displays more of a general area, indicating direction, and minimal range information.
When a guardian's health got sufficiently low, the guardian's [url=http://i.imgur.com/Mf42fzv.jpg]health bar[/url] appeared at the top of the screen. Once revived, the bar [url=http://i.imgur.com/lCKnIit.jpg]remained blue[/url] for a short period of time, possibly indicating a period of invulnerability. After, it [url=http://i.imgur.com/fw6N8am.jpg]turned white[/url], before disappearing again.
[Thanks Rafiki and vXFiddlerXv for your comments on this.]
[url=http://i.imgur.com/99u0vJc.jpg]Here[/url], we see what happens when your ammo is full.
Here, we see the opposite of a critical hit: [url=http://i.imgur.com/VugjVgk.jpg]Resist[/url].
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[quote]We've seen this before too, but [url=http://i.imgur.com/Mf42fzv.jpg]this shot[/url] has the Boss health bar at the top of the screen.[/quote] Isn't that the guardian's health? It went down when the guardian was hit, and when it was gone the person died.