It seems that Nexon income from Asian countries is higher or maybe they like their own nationality more than the game business! These people know the events about 6 to 10 hrs earlier and before each age we will see a Chinese or Korean teaser.
By the way in the video we see the wonders which are already mentioned by Tim (It will be good if someone translate the text), all units will have a new level as expected and I see two different helicopters it means that either we will have a nation with specific helicopter or the air strap will be upgradable in 2 levels. And finally the appearance of APC is good and is the same for all nations.