It has been mentioned that a small lighting improvement will be added, which looks really nice! There's also additional updates including generated alien ruins and more artifact missions. This can be read at http://undertowgames.com/blog/lighting-improvements/

Does anyone know when this update will be released? I'm really excited to play it.

Well, I guess only Regalis could tell us when the update is coming.

But well, judging from the existance of the post you linked, I guess it will be released soon.