It makes sense as a DPS class more than anything and I honestly cannot see it being a tank...but due to the fact that there are not many tanks, and the fact that many will flock towards thief at release, means it might potentially be a tank. Give it a high party/evasion rate, steal HP abilities, and steal enemy strength etc, it can be a great tank.

Maybe it'll be rogue class and thief DPS job and ninja tank job or vice versa. Any thoughts?