It sends the game back in time (well, further back in time), and kicks off 400 years before the events of Shogun 2. As such, while it retains the same game map, it introduces a whole new campaign, with six new playable clans replacing those from the main game.
Because of the time shift, there are also new units, as many of the existing ones hadn’t been invented yet. So there are 16 new land units, 10 new naval units, four new agents and four new hero units.
It’ll be out in September.
In case you missed it, Shogun 2 was released earlier this year, and it blew my socks off.