I think it's been unofficially confirmed that Samurai will be a DPS class when (if) they bring it to FFXIV.

Yoshi talked about Samurai when Heavensward came out. It was on the table to be one of the new classes coming with 3.0, but he said that he personally feels it should be a DPS, rather than a tank (and that's why they chose DRK as the new tank class in Heavensward), along with the fact that he didn't want to release two japanese themed jobs so close to one another (as Ninja was so recent).

I think it's fair to say we can expect Samurai to be a DPS class, probably sharing Chain with a Dragoon I'd guess, and I guess we'll see it in whichever expansion has us exploring the Doman lands as they're going to be very japanese themed.