I didn't get to play much last night, but . . .
Character Creation - Good, solid. You can choose from a list of preset styles for each major facial component, and then also go "advanced" and use sliders for more details. You can also save the particular head you customize, and then "blend" it with others. Useful I suppose if you wanted to create a "child" character between two others and have them look similar.
World Interactivity - Even very early on, where the game is still holding your hand a bit, you can see that there are a great many objects in the world you can interact with. You can sit on chairs and tree stumps, lay on beds in the inn, turn off/on lamps and fireplaces, pick up random items that you can use (such as some fireworks I found), climb trees (at least for one quest), and so forth.
Questing - Questing is probably the most "meh" part of the game. It's solid, and it serves its purpose, but that's it. There does seem to be an abundance of quests to pick up, some of which you come across as you explore (option, side quests). Others appear to be specific to your character race and/or faction. The quests are something to do and a way to get experience, items, and money, but that's it.
Combat - The combat is fun, but nothing groundbreaking. It seems to be a mix of the combat styles of most modern MMO's. You've got a hotbar that you put abilities on, and you can use most of these abilities while on the move (at least you can with the Archer class).
Skills - You start out with a few basic combat skills from the class you initially pick at character creation. When you get new skill points, you can pick and choose which abilities you want from that class set, so long as you have enough points for the given skill and meet the level requirement. At level 5, you can choose a secondary skill set from a different class. I know you can mix and match at least 3 skill sets, which gives you a lot of potential combinations.
That's it from my play experience . . . so far. I'm not going to wax on about all of AA's features, which are vast. I'm just going to talk about what I personally experience.