Yeah, I just noticed this too and was really scared about it at first. But I noticed that enemies still seemed to die around the units "not fighting" so I think they just haven't made animations for the units that "weren't fighting".Some units didnt seem to attack properly in the demonstration, but that couldve just been the wrong unit stance. I still have a hard time telling units apart, but maybe it takes some time getting used to.
At least I really hope this is the case.