Given that Scale armor is identical in stats to tank armor, I don't find it unlikely that the second job will be a tank. Note, though, that no other jobs have names based on other characters -- there aren't a lot of Dragoons, White Mages, Scholars, Warriors, or Paladins standing guard. I personally figured Templar would be a good one, being another lance-wielding FF job. Still, only time will tell.

Really, though, what I want is a chain on the lance so we can go all Scorpion on mobs. GET OVER HERE!