I personally believe SAM will be a Tank role under LNC with perhaps GLD as a sub class. His Relic Weapon would be a Naginata (you people and your obsession with katana lol).

I'm almost 100% positive that whatever the next tank class will be, it will be on the LNC. It's quests were more tanking checks than anything else and before I became a DRG, I was simply able to tell bad tanks to just let me tank and they can be carried. All it would need is some AOE hate generating Job skills.