So Much Game, So Much DLC.
The Witcher 3 Game of the Year Edition is finally out on GOG, Steam, PS4 and XBone and contains Hearts of Stone, Blood and Wine + 16 DLC's. That's a ton of stuff and you can get even more with it if you buy it on GOG. If you pick up Witcher 3 on GOG you get even more insanity including 3 soundtracks, comic books, manuals and videos. I'd list it all out here but GOG recently changed the page and it doesn't list out everything that the bundle comes with.
If you were interested in playing Witcher 3 now seems like a great time to pick it up!