Well first, and mostly, there were games being shown. Games, games, and more games. Here is a short list and features of the 13 games we were promised.

Metal Gear Solid 5: The Phantom Pain

• A truly open world experience
• Parcially takes place in Afghanistan and looks like it might also take place in Africa
• Real time weather effects
• Realistic passage of time
• Vehicles, tons and tons of vehicles: Jeeps, Tanks, Trucks, Cars and most likely mainy more
• Deeper stealth action (Dynamic dodging, crawling, etc.)
• Dynamic close quarters combat. Not much known about this except for a little showcase during the demo.
• A large roster of characters, some new, some old. Ocelot, Quiet, Snake, etc.
• Keither Sutherland is the new voice of Snake.

Killer Instinct

• Jago, Sabrewolf, and Glacius confirmed
• Xbox One exclusive
• ULTRA COMBO!!!! is back
• Still using a 2D fighting plane
• Will be released in 2013 and probably a launch title

World of Tanks: Xbox 360 Edition

• Free-To-Play
• For Gold Members that is
• Coming this Summer for Xbox 360

Sunset Overdrive

• Insomniac Games' newest project
• No gameplay was revealed, sadly
• Cinematic trailer revealed some good free running, mutant monster slaying, a vinyl launcher, and of course some damn good punk rock
• No release date yet
• Looks like it might be multiplayer oriented

Ryse: Son of Rome

• New Crytek game
• Xbox One Exclusive
• Combat in the trailer was shortened in length for time purposes
• Expect to fight a lot of enemies

Dark Souls II

• Expect to die. A LOT.
• No info on the story yet

Project Spark

• User created games / world
• Really cool idea and can’t wait to try this out!
• The possibilities are nearly endless

TitanFall

• Respawn Entertainment’s new game
• Mechs, free running, and overall epic.
• Bullet points dont do it justice, watch the reveal trailer.

Battlefield 4

The Witcher 3: Wild Hunt

• Will be open world
• Non-linear quests
• Combat has been reworked from the ground up

Dead Rising 3

• Takes place in California
• New hero named Nick, looks like he’s a mechanic 
• You can still combine items and weapons to make cool things.
• You can also call in Artillery Strikes
• Xbox One Exclusive coming out this Holiday Season

General Info:

• Xbox One Price tag is $500 USD
• Will be shipping this November.
• Your Xbox 360 accounts will carry over to Xbox One
• Xbox Live Gold Members will receive 2 (two) free game downloads a month. 
• Twitch.TV will be integrated into the system, enabling you to live stream any game on your console.
• A New Halo (probably Halo 5) will be released in 2014.

I think that's everything so far. If you want to watch the conference yourself you can always check it out on your XBox 360 dashboard.