This is the world tree 'Nordrassil', the first thing you see when you enter the new level 81 zone Mount Hyjal. A very significant lore location seen previously in both Warcraft III and the Caverns of Time.
... and here I am, having a little dance with Ysera the dragon aspect of dreams. Yeah, she's pretty important.
This fellow with the feathers here is none other than Malfurion Stormrage, the most badass Night Elf Druid to ever live.
So just what are Ysera and Malfurion doing here in Hyjal? Warcraft of course!