I'm pretty sure that thats a WHM.
Seeing as BLM's got a one-handed allagan weapon in the first coil, it would be safe to assume that WHM's will get a one-handed weapon this time, since BLM's will get a two-handed rod as it is depicted in the trailer.
And the way that miqo'te holds the weapon doesn't say much... I mean just look at the warrior, probably putting his shoulders out of joint o.O