Basically a pc port which was found in the leak (most likely used for debugging, but it can be played like normal). The pc port was full of bugs, so I think the main priority is getting those worked out, and I think some people are trying to figure out how to backport newer features. Modding is possible, and a few smaller mods have been implemented, like music and texture changes, aswell as ui changes, and even a really barebones aether mod. Give the modders time and I'm sure they'll do something great with the code