Not the OP but I thought I'd post some stuff that might be of interest to people not playing the PTR. Sorry for the big post.
Here's the entrance to the area, flanked by two Spellbreakers. The Kirin Tor symbols floating in the background are called Sunreaver Perimeter Wards and are clickable. Right clicking them 'charges' them, and right clicking a smaller symbol in the pedestals destroys them. Not sure what their purpose is yet and whether the models are currently placeholders on Horde side.
Rommath. Not sure if Halduron is around but I haven't found him.
This big guy is stood still on the bridges connecting the two areas that make up the hub. Level 90 elite, I believe.
There are several of these Sunreaver Mana Collectors lying around. Clicking them gives you a 60 second buff called Mana Flux which increases your haste by 30% and reduces resource cost of spells by 30%.
Aethas with Sunwalker Dezco.
There are mages stood around apparently empowering red Defence Crystals. Others are maintaining a red forcefield over a part of the hub that's being pelted with projectiles from the sea. I swam out to see what was going on, but PTR is PTR. Four Zandalari mobs were swimming uselessly and then a Zandalari Combat Canoe came whizzing out of nowhere and landed at the shore. The whole effect is pretty cool to look at, though.
It has a great atmosphere. Projectiles hitting the area can do significant damage to you. There's no music (yet), all you can hear is thunder and cannon fire booming in the distance, and some ambience. That and the environment give it a very ominous feel.