Alexim: I bring good news from the game developer: Consortium will be replaced by the Remaster, which should be free for those who have the old game. Tomorrow (April 21st) on Steam and soon on GOG.
SargonAelther: Will it replace the old version or become a second copy? Will the remaster have GOG achievements?
With GOG you never know, but from the way he talked about it, it sounds like a separate game.
Achievements are a real possibility but not 100% confirmed unfortunately.