In addition to announce StarCraft Remastered, Blizzard announced that the original StarCraft will become a free game.
StarCraft Anthology is the compilation of StarCraft and Brood War that until recently was being sold for €15, but that now will not happen more. Until end March a new update will be for Brood War (v1.18) that will improve some things in the game as the best online antitramposos guards and one time this update is released, the game can be downloaded free of charge.
Now is expected to be only on Windows but it says Blizzard that is also working on a version for Mac. And Yes, both the original and the remastered users can play online among them. Not bad.