EU guild For the Horde downed Lady Vashj on the PTR with GM assistance, revealing a new drop that, when used on a player, instantly attunes them to Serpentshrine Cavern. Here's a pic of the new drop. Source: World of Raids.

She also dropped 25 Vials of Eternity, the items needed for attunment to the Hyjal event. On live she only drops 4.

It's nice to see Blizzard acknowledging the concerns of players over the rather extensive attunement needs, especially when it comes to alts or new unexperienced raiders.