Anime-BlackWolf: Uh, my bad. That makes the situation worse.
Warner has never brought the official PC ports of part 1 to 4 here, they are all arcade ports, even if the PC ports of those games were not bad at all (not even as a bonus).
So the only option for Warner to bring "Trilogy" here would be a console emulation (I doubt Warner would invest the costs for a proper PS1 or SEGA emulation licence) OR the old PC port of the game.
And they do not like the old PC ports as it seems... Very bad signs for the game. :(
What are you talking about?
The versions available on GOG are original PC ports. Which is not necessarily a good thing because, while generally close to arcade originals for the most part (except MK2 - I still don't know how they could mess it up so badly) they are generally worse.
The only "arcade port" that PC got was Mortal Kombat Arcade Kollection. Available for some time on Steam, then taken down because WB couldn't be bothered to patch it (that port has its own problems - on every platform).
If MAME versions could be sold here (not going to happen for legal reasons) - that would be great.
Edit:
By the way - I fully expect Injustice 1 to show up here eventually. Newer games may be problematic and I covered the case of MK9 earlier. The multiplayer may be cut out, but there is enough single player content.