Calradia Slave Rebellion.

[Swadius]

It's funny to see that nobody's talking about what is important about the trailer: the PvP gamemode addition, the first RTS by 1 king in each faction (the king do the 'RTS' part hiring units (miners, defense, engineers), doing buildings, researching technologies and more) and the players fight together in the battlefield to defeat the enemy king, conquer flags to make money for the king, etc... You also share account and character with the Invasion gamemode, so you can play PvP or Invasion by your choice by server, without need to going to another Module (but PvP is more focus on middle-high levels, so it's recommended to level up in the invasion gamemode). It's something unique that you never see, so why don't criticize that unless the introduction of the trailer?

All I see in the trailer you posted is some dude riding on a horse with a book, and players fighting peasants. I don't think you can blame him for not seeing all the features of this mod in the trailer when the trailer presented shown none of these things, or at least shown none of these things clearly.

It might pass as an entertaining trailer, but it's not informative in the least.