Updated: Quantum Break will be released on PC and Xbox One on April 5th.
In Quantum Break time is malleable and players can manipulate this resource in their own benefit. Everything is packed in third person action dynamics. The game will be available on April 5th on Xbox One and maybe on PC too.
GameStar published an article where they claimed someone from Remedy assured them that Quantum Break would be released simultaneously on One and PC. GameStar have already removed the article, but there is an evidence of that publication:
Microsoft and Remedy will drop more info and a new trailer of Quantum Break today. They could reveal the PC release in that event too. Stay tuned.