For those who did or haven't seen the 2012 Microsoft Xbox Briefing here are the bullet points for your easy digestion:

Halo 4 openings the show beginning with live action transitioning into in-engine cinematics and finally into gameplay.
Don Mattrick enters the stage to officially kick off the briefing
Splinter Cell: Blacklist is first up ( revealed for the first time) with a gameplay demo. The Mark and Execute is back in a big way with “Killing in motion”. Kinect integration is apart of the game where you can literally talk to the enemies through Kinect by whispering distractions to them.
EA Sports’ Andrew Wilson is next up to talk EA Sports with Kinect. After a brief showcase of FIFA 13, a switch to Madden 14 is up next with the appearance of Joe Montana barking out play calling and hikes via Maddens new Kinect integration. Madden 14 lands on August 28^th, 2012.
Next is a new trailer for Fable: The Journey.
Phil Spencer makes his way onto stage.
Gears of War is next up with a trailer for Gears of War Judgement coming in 2013.
A trailer for Forza Horizon ( releasing October 23^rd, 2012) follows up Gears of War.
Head of Strategy Yusuf Medhi takes the stage to show off Kinect voice search on the Xbox dashboard. The NBA is headed to Xbox with NBA League Pass as well as the NHL with NHL Gamecenter. ESPN will start to stream all of its live programming in HD on Xbox 360.
Xbox Music/Video (out with Zune) is announced for the first time with over 30 million tracks on Xbox, PC, and mobile phones.
To round out the Kinect centric part of the briefing is Nike with a fitness title Nike + Kinect Training.
Marc Whitten makes his way onto stage to talk about Xbox Smart Glass. It is to work with your Windows, Apple, and Android devices.
Internet Explorer is announced to finally be coming to Xbox after years of everyone asking why Xbox had no browser when the competition does.
Windows 8 to also receive Xbox Smart Glass.
Tomb Raider is the next game demo with brand new gameplay.
Phil Spencer is back on stage. With Xbox Live Arcade we are introduced to Signal Studios’ Acend New Gods (releasing in 2013). Next is Twisted Pixels LocoCycle. After that is Matter (also releasing in 2013).
Capcom’s Resident Evil 6 is the next game demo.
Wreckateer is the next game demo ( releasing this summer on XBLA).
Next is SouthPark: The Stick of Truth.
To follow up South Park is Harmonix with Dance Central 3 with a performance by Usher.
Don Mattrick is now back on stage to bookend the briefing with new Call of Duty: Black Ops 2 gameplay.