Looks more to me like they haven't got the blending down on the animations more then anything, it's one thing that guildwars 2 nails really well which makes every action you make the character do transition into the next almost seamlessly without the action lock that plagues FFXIV currently.

This is something they can tweak certainly, it's not a hard thing to do and really just comes down to the animators getting animation timings right so you can keep that fluidity of motion on the characters.

However I'm a gameplay over graphics man so I'm not to phased on the stop/start nature shown in the trailer.