Free Darksiders 2 definitive ed. upgrade for regular ed. owners PC ONLY
Apparently there was a confirmed website by nordic that if you owned Darksiders 2 and all the DLC you'd get the Definitive edition for free. I can confirm that you get the Deathfinitive edition if you own DS2 and the DLC. Not sure if you get the DLC if you just own the game.
Also looks like Darksiders 2 and the all the DLC except for the soundtrack has been removed. The Deathfinitive edition takes it place.