What they're selling this game on is the targeting system. All attacks/spells must be targeted to be effective, so say you have a wide swing, only the enemies in front of your attack range get hit. Or if you're a healer, your target has to be inside your scope, or your AOE radius to be effective.
You also have to dodge enemy attacks, where if you do get hit, you have a chance of getting knocked down and stomped on while defenseless. The melees have some kind of roll ability that i've seen, and the tanks have their shield. Healers have some kind of magic bubble.
It looks really good, and I heard their 3rd CBT just finished a while ago, so it looks like it may come out within the 1st - 2nd quarter of 2011.
I'm just worried that it's going to be like Aion...such a K-grind.
link to US site.
http://www.tera-online.com/