Figured this deserved its own thread. I hate to be the bearer of bad news here, but my previous statement that GK would be available on Linux turns out to be incorrect. I wasn't previously aware of this (I should have been, but wasn't, entirely my mistake), but that wasn't actually ever part of the agreement with Activision. Just PC, Mac, Android, and iOS devices.
It's also worth adding a quick note here in case people don't see my clarification later in the thread - Linux was never a platform we were developing for and I simply assumed that it was. Shoot the messenger if you need to, this was entirely a bad assumption on my part.