They are making a sequel to one of my favorite mods for HL1, Natural Selection. For those who don't know what it is, you play as either the Space Marines or the Aliens. The Marines play like a FPS, but one play plays the role of commander, which plays like a RTS. The aliens don't have a commander unit so players have to work together to build turrents and collect resources for upgrades.
Wki page
http://en.wikipedia.org/wiki/Natural_Selection_%28video_game%29
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