After far too long without releasing any mini-games (I'm guessing they are still smarting from the failure of Dreadfleet), GW will be releasing a new co-op boardgame where the players play Imperial Assassins. Here is an unofficial preview from the Spikey Bitz website:

http://www.spikeybitsblog.com/2015/04/new-assassin-game-contents-revealed.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+SpikeyBitsFeed+%28Spikey+Bits+Original%29

Could be cool. I'm looking forward to the multi-part plastic Assassins! I've long thought that GW should use mini-games as a vehicle to release figures that don't warrant mass production, but would be coveted by 40K collectors.

Now if they would just put out an Imperial Navy vs. Space Pirates game...

This seems like a pretty sweet game, I'm excited to see how the Assassin models come out.

Don't know if I'll get it, but it does look cool!