Galaxy in Turmoil [Steam] is an upcoming shooter that looks promising, with large 32v32 battles that take place both on the ground and in the air. The developers are looking to do a Linux version too.
From what I understand, it started off as a fan-made Star Wars game, but Lucasfilm got involved and asked them to remove all Star Wars related IP and so they're now going their own way.
Built with Unreal Engine, the whole idea of the game does sound rather impressive. We don't really have much at all like this on Linux, so the more the merrier. The developers claim it will have a "never before seen competitive mode", so I will be interested to see what they come up with.
Writing on Steam, one of their developers said this recently:
Native Linux support is still on the cards and is definitely something we'd like to do :D
From a later post, they also mention the fact that they're actually a Linux user themselves which is really fun to see.
Have a look at their gameplay teaser:
If you do wish to see it on Linux, it would be worth giving it a wishlist on Steam (make sure you set your platform preference in Steam's settings). It also wouldn't hurt to give them some words of encouragement in this linked forum topic.
Hat tip to Iiari.