This was released recently, it shows some 5 man content from the game:
http://www.swtor.com/media/trailers/e3-multiplayer-demoOn the surface, kind of standard MMO dungeon but theres a quite a few things that stand out:
1# Minor roleplaying aspects. It looks like there is party conversations where each person can choose what they wish to say.
2# Ranged tank that isn't kiting.
3# Ranged combat that doesn't look lame.
4# Cover system.
5# Healer thats still fighting and healing.
6# Enemy Jedi that require another Jedi to off tank.
This battle looks like a minor mini boss fight but even still it seems fun and dynamic, not like the heavly scripted battles warcraft has turned into.
Dungeons are some of the worst things you can add to a MMO because they are so static and linear. After a while they become treadmills which only 2 people need to be awake, the Tank and the Healer. Warcraft has become this and its killed the game for me, but hopefully the 5 man content in TOR will more interesting like this video shows.