A thread over at the huge gaming community NeoGAF is full of Xbox One related tidbits including confirmation of Crackdown 3, Forza Horizon and more. The source "ntkrnl" is not a regular user, but his insider status has been confirmed by longtime moderator "Bish". So while the information should be taken with a grain of salt, at least there is some degree of authentication.
On the hardware side of things a white Xbox One was confirmed and the possibility of a $399 Xbox One in 2014 without optical drive was hinted at. A limited edition 1TB Xbox One is set for fall release.
Forza Horizon: "Fall 2014, probably September. Super sexy weather system and... shit tons of co-op/social stuff. 1080P and open-world, so you can road trip with your bros."
Crackdown 3 - announcement isn't near, likely a 2016 title.
Titanfall will get its first DLC 45 days after release, with a second days 120 days post release.
The new Gears of War will likely need 2.5 years in development. The cancelled project at Black Tusk was "Shangheist" - with no real details beyond the name.
Quantum Break set for holiday 2014. Sunset Overdrive fall 2014. Fable Legends is summer 2015.
Take it for what it is for now. Rumours.