I don't have much to add to this press release from Remedy:
Today, Microsoft Studios announced that the highly-anticipated action-adventure Quantum Break will launch in 2016.
“With so many Xbox One games launching this year, moving Quantum Break to 2016 extends our incredible portfolio into next year with a monster new IP,” said Shannon Loftis, Head of Publishing at Microsoft Studios.
Quantum Break is created by Remedy Entertainment, the critically-acclaimed studio behind Max Payneand Alan Wake. Featuring Remedy’s highly acclaimed storytelling, Quantum Break fuses an intense action game with top-of-the-line live action elements into one revolutionary entertainment adventure.
“We’re really proud to be part of the incredible Xbox One line-up,” said Sam Lake, Creative Director at Remedy. “We thank our fans for their patience, and want them to know that the team is taking advantage of this opportunity to polish and fine tune the game to create the kind of standout entertainment experience they’ve come to expect from us.”
What I will say is the reasoning of "with so many Xbox One games launching this year" is slightly ridiculous, unless MS have some real showstoppers lined up for E3. I mean with Halo 5, Forza 6 and Tomb Raider the lineup is pretty good but certainly nothing to boast about.