The big Gamescom gaming event is going on in Germany right now, and as promised BioWare has shown off part of an end-game raid for The Old Republic. What they showed off was the Eternity Vault, and they demoed it with a group of eight Sith Empire characters so you could get a good example of what it will play out like if you choose that side.
Unfortunately the demo only showed off the first couple encounters in the raid. The first is of the group disabling a couple of turrets while dealing with trash, and the second was a giant robot boss that they wiped at. In all, the demo lasted only a few minutes; but they did show a trailer after it of some quick glimpses of the instance that they were unable to show live.