As I'm sure you all know...can be found here: http://www.gametrailers.com/game/final-fantasy-xiv-online/11432
I picked up on a few things I liked. The running animations. To me personally I find them more realistic looking then most games. But that was just the three characters I saw. The stop animation is what really impressed me. I'm so used to the unrealistic dead stop out of a sprint from other games that I find the little stop shuffle they do incredibly refreshing. The targeting is another aspect I enjoyed. I liked the spinning wheel around your target, let me know right away what my focus was. I'm used to wow with a shaded circle on the floor under your target which can easily be covered by other objects/creatures...etc. I greatly enjoyed the view in the game, very lush detailed world that looks like it will take me a great deal of time to explore fully.
What I didn't like were things I found alarming, and are partially what annoyed me about FFXI. In one of the videos it shows the female Elvaan(or whatever they're called now) running at a small hill but not being able to drop down. Much like most of the terrain in FFXI. Maybe it was just a glitch, but I don't like a world that looks big but is actually small when you try to run to these new places you're foiled by a simple tree stump or small rocky lump. I also didn't see any jumping. Which only helps to hinder travel. I haven't heard any gameplay music either. That bothers me a lot about XI. Zones without music. Just the sound of the wind in the background. Square is responsible for some of the best music scores in videogames(IMO) and I would hate to see the talent wasted on musicless zones.
The mouse target was another thing that I didn't like. When the mouse was over a potential target. There was no semi-highlight to let you know that if you click now THIS is what you will target. It would be a simple feature to add and I hope they take the time to. The teleporting that was done by the Taru didn't look very nice. You see the character spawn then the world construct itself around him. A minor flaw, but still one I find annoying. And finally I found that the characters STILL run into each other for a brief second before being allowed to pass through. This was such an annoyance in XI for me attempting to tackle my way to the auction house. I hope this feature is removed in the future.