This is something I meant to speculate about here but I kept forgetting to post.
I listen to Liquid Metal on SiriusXM a lot and Matt Heafy from Trivium keeps saying he is working on a “childhood favorite” game score. Here is an article about it: https://guitar.com/news/music-news/trivium-matt-heafy-working-on-soundtrack-for-video-game/
Of course my first speculation is Killer Instinct. He loves the Doom soundtrack which is done by none other than Mick Gordon. He is a metal enthusiast which is perfect for KI.
Remember, all speculation, but since KI news is starting to rumble I think it’s a decent chance of being true.