A fan submitted a few screenshots of a mysterious temple in the southern side of Silithus.  If you haven’t explored Silithus during the current patch, you have missed the introduction once more of the Anubis Obsidian statues(from Warcraft III: The Frozen Throne).  In closed beta, the Anubis Statues guarded the Great Wall of Silithus. With the introduction of Retail, the guardians were removed.  This patch added a roaming Anubis statue named Setis.  It may be a hint that Arthas the Lich seeks to assimilate—into the Scourge, the ancient Azj’Aqir kingdom, ancestors of the Silithid, and cousins of the Northrend Azjol-Nerub Empire of Spiders.  The fan mentioned there is an instance inside the temple.