Right now my raid is in Black Temple working on Teron Gorefiend. BT's my new favorite instance, thanks to cool fight design and some some neat little details like this one, above. At a certain point as you're clearing trash, you enter the room where the Shade of Akama is being held. Without warning, Akama himself (for whom you've previously created a distraction so that he can sneak into the temple) appears out of nowhere, looming over you (especially if you're a gnome!). It's a cool effect, and a fun fight.
All kinds of patch 2.4 excitement is bouncing about the interwebs now that the PTR is up, and I'll be on the PTR and talking about what we have in store, soon.
Update: Gorefiend down, moving on to Azgalor.