E3 2013 is still a week plus away, but NCsoft is not waiting till then before releasing the latest trailer for Aion 4.0: Dark Betrayal. The new content will arrive in the North American server later this month.
Different from the Korean and China versions, the trailer focuses on the storyline, where Beritra, the Dragon Lord who betrayed Tiamat, is set to unleash a powerful weapon to obtain dominance of the world for her kind.
In case you are curious, the trailer below is from the main Korean server. More information can be found here, and sadly, the 3rd mecha class is still MIA now.