I got a few plays of GW's Rise of the Orks in, and I like it. It's a easy to play solo/co-op Tower Defense game. The player(s) get five Terminators and must kill all the oncoming Orks before they destroy the shield generator. 

The board is a little bland, but it clearly conveys all that is needed: The Ork entry points, the Terminator's starting bunker (where they can go back to to heal), the shield generator control panels, and the special supply card pick-up points. The Terminator figures are very nice, and push together with ease. They are molded in their respective Chapter colors, and in good poses.

The Orks arrive in waves, all coming randomly from the draw pool, and are placed randomly at one of the six entry points. There are several different types of Orks: Boyz, Nobz, Kommandos, Burnas, and Meganobz. Some characters as well: Mek, Big Mek, Painboy, Weirdboy, and the Warboss. The type and numbers of Orks in the draw pool is determined by your difficulty level.  

Each of the Terminators have a unique weapons loadout and special ability. If the Orks destroy all the Shield control station, they win. If the Terminators get knocked down too many times, the orks win. 

If all the Ork tokens are removed from the board, and the draw pool is empty, the Terminators win.

It plays very quickly, requires some strategy, and a bit of luck. Definitely falls into the fun filler game category. A good choice if you want to play something 40K themed, but don't want a large time/effort commitment.
 

Go Roll Some Dice

And Purge Some Xenos