I haven't been following this too closely. I've historically not been a huge fan of Asian MMO's, I've always found them pretty grindy and a little weird for my tastes. However this whole Combat Formations system does sound pretty cool.
Instead of having the trinity roles of Tank, Healer and DPS you get Combat Formations. The example used is that if your group is in a straight line formation you boost the DPS of the character at the front of the line, if you're in a circular formation you boost the groups defense, etc, etc.
I'm a little skeptical but it does sound really cool. Check out the video.