We ventured on the PTR (EU, pve) today as well. Our setup was a bit mediocre (6 priests, 5 shamans at some point :P) and we had to get some pickup guys as too many guys were not interested but it turned out to be fun.
The trash is on a 2h repop, before the first boss there's some annoying elementals on a 30 min timer, but 2h for the big pulls. One trash group frustrated us a bit, but after a few pulls we got past that too.
Also we had a very nice trash drop, this 1h mace:
http://img100.imageshack.us/img100/4902/macewh9.jpg
Random gems seemed to be quite frequent drops as well, we got three or four.
The first boss, High Warlord Naj'entus, didn't seem all THAT hard, if there's not something difficult happening later in the fight. He does some aoe stuff that requires the raid to be spread somewhat, he throws a thing at random guys that needs to be picked up and used against him. Also more then 8500 hp is very much needed. :P
We just started to get a hang of it when a friendly GM showed up and spawned this dude here:
http://img516.imageshack.us/img516/9...skataurub4.jpg
The next attempt the poor boss got touched to death, dropping this:
http://img152.imageshack.us/img152/8...ordlootsj7.jpg
After that I found myself kissing the floor here:
http://img511.imageshack.us/img511/2344/gurtoggmp8.jpg
The GM had killed all the trash up to Gurtogg Bloodboil and teleported the rest of the raid to him shortly afterwards. We wiped on him about 45 minutes or so. Also a very cool encounter it seems. The boss is not-tauntable but you will have to switch tanks at some point (there might be an aggro reset though). After a certain time he puts a *your actions do not matter* debuff on 24 guys and a +30k hp on another, enrages and immediatly attacks that one dude. When the enrage wears off, the fight continues.
Apparently the GM had seen enough and killed the poor orc:
http://img518.imageshack.us/img518/6...ogglootqf8.jpg
After that we got moved over to Teron Gorefiend:
http://img100.imageshack.us/img100/3...refiendgz6.jpg
All I know is that the whole raid better has a pet bar avaible for this fight. Also Mr Gorefiend had 4.6 million HP, I think I read that another raid encountered him with 6 million before, so that apparently got nurfed already.
The three boss fights we saw there all seemed interesting at least. Although if you hardly have to do any trash, I suppose every instance feels good. :P