Early on in the video, we get our first glimpse (in my memory) of this bar, and it does some interesting things throughout the video.
[url=http://i.imgur.com/Hgg0GsI.jpg]Here[/url] it is not fully charged, but with a 2x multiplier on it.
[url=http://i.imgur.com/MUtXNqO.jpg]Here[/url] it is gold and flashing, indicating a full super charge.
[url=http://i.imgur.com/RKkr2Rq.jpg]Here[/url], a hunter has just thrown a knife, resulting in a [url=http://i.imgur.com/a9sWJLk.jpg]2x multiplier[/url].
[url=http://i.imgur.com/Gnsdjt3.jpg]Here[/url], the hunter is about to golden gun. Notice the 2x multiplier, and the whited out super slot. [url=http://i.imgur.com/txJW0Lr.jpg]After the move[/url], the multiplier is gone, but the super move has immediately recharged.
[url=http://i.imgur.com/ZbtA8D6.jpg]Here's a warlock[/url], about to charge the bar. [url=http://i.imgur.com/LK42ibT.jpg]After killing the next enemy[/url], "Super Charged" appears on screen, and the warlock has a 2x multiplier.
Sometimes the bar acts like a timer. [url=http://i.imgur.com/p65KJkw.jpg]Here[/url] is a hunter who has just used golden gun. Notice the Super bar is out to the right of the ammo counts. [url=http://i.imgur.com/7ALKCaR.jpg]After about a second[/url], it's now between the ammo counts. [url=http://i.imgur.com/bEPN3d4.jpg]Still later[/url], it's completely to the left of the ammo counts.
[url=http://i.imgur.com/NvdcXz3.jpg]Here[/url] we see a warlock, with a 3x multiplier, about to rain down some nova bomb destruction. [url=http://i.imgur.com/FcF9IBq.jpg]After the blast[/url], you can see the warlock now has a 4x multiplier.
[url=http://i.imgur.com/lCKnIit.jpg]This guardian[/url] is revived with a charged super. Perhaps this is a passive ability of either the downed or reviving guardian.
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What I noticed in the video was that the bar would charge when the player or another member of the fireteam picked up the Orbs of Light scattered about the area. They also seemed to earn bonus charges for certain actions like chained kills or using their Supers. This would seem to tie in into what we were told about the player receiving certain benefits when teamed up with other players, as having multiple team members taking out bad guys in a spectacularly messy fashion, as well as gathering Orbs, would definitely allow for faster recharge of their Supers through this system.