A bit of Croteam news to start the day with and there's multiple interesting items to go over in regards to their games.
I love how active Croteam are with their community, they're constantly replying to all sorts of random questions from players of their games. Thanks to this, we've been able to learn a few things about their plans.
Firstly, their fantastic puzzle game The Talos Principle is going to be moving over to their newer Fusion engine, they said it will be "Hopefully very soon". The VR version is actually already on it, so that's not surprising.
In response to another question posted in that same Steam thread, a user asked about DX11 and OpenGL being removed from their games, to which they said "2) Yes, OpenGL sooner, DX11 later.", so they're going all-in with Vulkan and DX12. You might remember they were originally going Vulkan-only (or at least, that's how it seemed), but DX12 gave them Xbox One compatibility.
Finally, as a little teaser and again in response to another user question about Serious Sam 4 they said "Why do you think we are doing all this - adding those things to the engine, improving stuff, etc - in the first place?".
Personally, I'm quite excited by Serious Sam 4! Having another quality FPS on Linux that uses Vulkan is going to be great, although it's likely still quite some time away from any kind of release.
Thanks for the tip mphuZ!