Honestly not really, we have Paladin, Dark Knight, Warrior, Dragoon, Ninja and now Red mage that beat the shit out of people with sharp implements. I would much rather see something more martial arts of magical like Dancer or Puppet Master. Samurai is a neat image but in terms of gameplay its just a guy hitting things with a sword, two swords or a spear. We kind of have those bases covered really.
Personally i would like to see a new tank, maybe something like WoW's brewmaster in playstyle. They could use a job like Beast Master, Blue Mage or Magitek Knight for it but could also take something from another SE ip like Bravely Seconds Exorcist/Phantom Knight. Mostly because getting SAM now when the new big bad is a Samurai trained in Rabanastre feels a bit wierd and all the more so when it would feel more in line with a frontline leading a charge in an othard expansion.