That header image up there is probably entirely too small for you to see, so go ahead and click on it to make it larger. Or you can click here to see it on the Warcraft Anniversary site.
The only parts of the header graphic that are visible when you visit the site directly are the figures in the front, Varian Wrynn and Thrall, standing on opposite sides of the page. In the full image, when enlarged, you can clearly tell there are additional figures off to the side of each of them, shrouded in shadows. Who they are isn’t exactly a secret if you look closely – it’s obvious that standing with Wrynn are the Prophet Velen in the back, King Bronzebeard next to Varian, and a night elf woman who is likely Tyrande Whisperwind. Over standing next to Thrall we can clearly make out Sylvanas Windrunner, Cairne Bloodhoof in the back, Lor’themar Theron next to Sylvanas, and likely Vol’jin down at the bottom.
So we know who they are, and we know where they stand, but why are they in the background and why are their faces blurred out? There are already interesting unrevealed things afoot at the anniversary minisite, like the interviews and special video, and the fact that the celebratory Battlecry contest (where players print out the Horde or Alliance symbol and take snapshots of themselves holding it in interesting places) has revealed a part of a photo mosaic that’s being revealed piece by piece.
It’s possible – although not terribly likely – that the banner plays a role as well. We’ll just have to wait and see. Besides, I love the art in the banner – they should take the Horde and Alliance faction leaders and turn each into a desktop wallpaper we can download.