They were not but there are 2 things pointing to a very likely possibility of them being 1.
1.) the leaks have mostly been correct so far and they list gunblader as a tank
2.) the game got 2 dps jobs last expansion and the game does need a healer and a tank to balance out the raid compositions
And like I said why shouldn't it be a tank?
Cant tank and healer players get new jobs too?