Definitely on the list of most anticipated jobs to be added, this could either be implemented either really well, or very poorly.

I'm a little worried that if and when Thief finally arrives it's going to stray too far from it's roots, and be nothing more than a generic "MMO Rogue."

Thief (according to several polls that I am way too lazy to find and cite) was one of the most beloved jobs from FFXI, and it wasn't because it followed the tracks of the "Rogue MMO trope." Thief stood apart from the standard dagger playstyle in that it wasn't a straightforward backstab spam class. It had a lot of utility.

Please don't turn Thief into a generic MMO rogue that Stealths around DoTing, Backstabbing, and Stunning. Save that for the Assassin Job; many of us thief fans are purists.