Entering my inbox recently was an update on the roadmap for X4: Foundations [Official Site], Linux is still in their plans but that date isn't too firm yet but we now have an idea of when it might be.
In December, Egosoft release their big 1.50 update which came with their first attempt at an online mode, which is a pretty huge thing. They're committed to further developing X4 as noted in the email from their PR team to us.
There will be a few minor updates, along with a huge 2.0 update in February, this will add in the "ability to compete with the faction shipyards by selling ships to the war factions or build your own fleets". Additionally, it's going to focus on making "crew training a bit easier.".
After that, is another big 2.5 update planned which will introduce a new Resupply Ship-type. It will also add in a "Sector blacklists" feature, to tell your ships to avoid at all costs along with improvements to inventory management.
While that all sounds good, what about Linux support? Well, here's what they noted in the email:
Linux version: The Linux beta can start somewhere between 2.0 and 2.50 already but at the latest together with this update.
So hopefully this means around February-March we will see a Linux beta.
Further out again, is another huge 3.0 update that will add in "the ability to dock directly at a station in a spacesuit and to get other NPC ships to transport you, by offering missions to them". The big 3.0 update will also add in "a number of new and improved combat missions" and so on.
They say that each major update, is also going to expand the online mode even more which sounds rather exciting!
Finally, a full expansion is planned that will introduce the "Split race, their ships, a new Split economy and of course a large new area of space shortly after releasing 3.0".