I thought the characters animations on the trailer were.... well, pretty bad compared to what we have now, but at the same time it felt like the animation lock was still there.
Even though I don't think the problem on v1.xx was the animation lock, but the lag that don't really let you react in time.
Still I think the solution for keeping the weight and realism of the characters after performing actions can be dealt without animation locks: Just add more movement animations like rolls or whatever movements you cold do after performing an action and want to move the hell away, we are warriors and we are heavily trained, our characters should be able to do this:
Simple martial arts rolls:
http://www.youtube.com/watch?v=8h--81cAk1M
http://www.youtube.com/watch?v=Q4K_OyUlcVU
Parkour Rolling
http://www.youtube.com/watch?v=W4g0PeLVKT4
So imagine you are performing a dragoon jump and want to get the hell away because you see the ifrit cracks appearing and you are pressing the left key, the dragoon could roll to the left while landing instead of just standing there and then reacting and moving to the left.
Just an idea.