There's rumors of Herobrine coming in 1.3. The theory is that with Bukkit being involved, and one of the most famous Bukkit plugins being a Herobrine one, they might want to do this. A VERY vague site was found suggesting this, and an extension of the site leads to an IRC thing which another Bukkit plugin uses for IRC connection.
This is probably all bullstuff, but with the mysterious hieroglyph blocks and part of Herobrine's initial appearance including pyramids...
Ya, I was talking with the MinecraftWiki admin who is having a hard time keeping his adminship since he manages the Herobrine page and theories. He got me into that.
iron golem looks GROSS!
Get a texture pack.