I've seen him. He's a mysterious Arcanist giving out free buffs and ominous dooms-day prophesies. First time I ran across him, I had just ported into Uldah and saw the GM symbol. I immediately ran over, hoping to grab a screenshot of the nifty shiny red armor, only to notice--he's not really a GM! And then he looked right at me and spoke a spooky message! He never repeated it for anyone else that ended up gathering around though. He did give all surrounding people some really nifty buffs though, before he vanished into thin air.

If you read "The Last Word" on the lodestone, you hear mention of this guy; and if you ever read the mysterious stone placard that Yoshi-P posted up very early in his new reign; this mystery Arcanist quotes a bit from it.

That and the Deaspected crystals going around... Something huge is going to happen--possibly in Grid--and I am SO excited! I LOVE the way SE is pulling the strings on this one.