As some of you may have noted, any bandit attacking you wielding a Nordic Greatsword will have this weapon incorrectly displayed as sheathed (on his side, like it were a one-handed weapon). I'm not yet sure if this also applies to the Nordic Warhammer. He bangs away at you in the same manner as using any other 2-handed weapon, but the weapon is not in his hands. This is a bit of a bummer and another weird minor bug to boot.
Should any of you good people come across similar graphical bugs added by the Dragonborn DLC, please don't hesitate to post them here!