MMO-Champion have a whole heap of information on the loots you'll find in The Sunwell.

• Items seems to be ilvl 154~155
• At least one of them is ilvl 164 (Apolyon, the Soul-render), we can assume it's a loot from Kil'jaeden. I didn't try to get the ilvl for all items, maybe there are more loots from KJ.
• Even if they're legit, these stats are probably from early beta servers and could be changed/removed once the 2.4 patch is released on PTR.
• The feral staff is with the caster weapons, I know, I'm not redoing the screenshot just because of that. :/
• Nothing is confirmed by Blizzard, trust it at your own risks.
• (Bonus) It seems that the Arena Season 4 sets will be named "Brutal Gladiator". This one is still fairly unconfirmed though.

• Sunwell Isle will be located off the coast, north of Silvermoon, and will be patched in with patch 2.4
• Sunwell Isle will be a major questing hub with a 5-man Normal and Heroic Instance (Magister's Terrace) and a 25-man raid (Sunwell Plateau). The goal with Sunwell Isle is to close the Burning Crusade storyline before the release of the next expansion.
• There are still a few scenarios left that could be released to provide the players with more content if WotLK gets delayed for any reason.
• At the release of the patch, players will access a small expedition camp where they can start questing.