If you're looking forward to the 3 new classes (Mech, Gunner, and Bard) featured in Aion 4.0, Korean Aion has slowly been releasing information about the new Gunner class. It looks slightly western and appears to use duel pistols or a two handed gun. They've released some screenshots, started a contest for the guns, and now there's a video showing gameplay for the Gunner. All information is available from the official Korean 4.0 preview site and is shown below for your convenience. Keep your eyes peeled as new information is revealed there.
Gunner Concept Art
Images from the Gunner Weapon Contest