I figured it's too late to put up E3 info, but who cares!? I might as well, can't cause any harm. This is going to be split into 3 sections, Nintendo, Sony, Microsoft, and (my favourite) PC. Please note, I won't be going into any detail here, it's just a summary.

Nintendo
The main thing Nintendo has going for them right now is obviously the Wii U. Throughout history, Nintendo has owned the gaming business, always coming out on top. This changed during the 7th generation of consoles, when Nintendo made the wii. It was a much less powerful system and was mainly used by casual gamers. The Wii U is their attempt to bring back the hard core gaming audience. This includes a graphical revamp, a more powerful system, and more mature games. Some games revealed for the Wii U's launch lineup include 

 
Zombi-U, an M rated (that's right) zombie shooter, taking advantage of the Wii U's gamepad in many interesting and unique ways like using the screen of the controller as a scope for your rifle, or a console you need to hack, while being able to look up at your main screen to watch out for nearby zombies.
 
 Assassins Creed 3, a continuation in the Assassins creed series taking place in the American revolution (1773 to 1783), also releasing for xbox 360 and PS3.

New Super Mario Bros. U, the inevitable Mario Bros. game, utilizing Mii's for cooperative play, and not much else new.

Smash Bros. U, not much information, but being a Smash Bros. game, it's expected to be good.
 
Rayman Legends, a 2D platformer based off of the first Rayman games, now featuring co-op.

Pikmin 3, the long awaited sequel to the first 2 critically acclaimed pikmin games, now featuring a new kind of pikmin (rock pikmin) that will be used to utilize the environment in new ways, like smashing through walls and building rock bridges.

Metro: Last Light, a sequel to the great post apocalyptic RPG shooter, Metro 2033

Scribblenauts Unlimited, another new twist to the Scribblenauts series, this time adding the ability to create your own items with matching words, literally adding unlimited items, as the name suggests

And many more games including smaller party games and rereleases that I won't be talking about in this short summary.

Secondly,

Sony
 Sony hasn't had any hardware news, but they did talk about a lot of quality titles.

Last of Us, ironically the first game in this list, is by the developers of the Uncharted series, which could mean major success, and maybe a new franchise. The game seems very reminiscent of Uncharted, shooting, adventure, discovery, blood, gore, and HD graphics.

Beyond: Two Souls, is another bud that might blossom into a popular franchise. Everything in this game by the makers of Heavy Rain happens in real time, one of the many ways a player is supposed to be able to become fully immersed in this psychological action thriller.

Wonderbook, a world based on J.K. Rowling's Harry Potter series.

 Next up,
 
Microsoft
 Not the best conference at E3 this year, Microsoft had not much but smartglass, a service for viewing movies back and forth across different platforms, including your computer, your xbox, tablet, and smartphone. Smartglass can also help you use your tablet as a controller for your xbox. Real clever microsoft, thinking outside the box on that one.

Last, but definitely not least,

PC and General
There were also some other games that couldn't be held to any one of these companies. Some are third party games for all 3 companies' systems, some are only for PC. Without further ado, here they are.

Dishonored is Bethesda's new steampunk styled game, called by some a perfect mixture of steampunk, assassins creed, and free choice. This game focuses on being able to go about doing things however you want to do them, or like in Skyrim, you can just go do your own thing instead of focusing on the main quest line.

ArmA 3 hasn't released much new info, but never the less, this game is highly anticipated by the ArmA community, recently expanding due to the Youtube popularity of the ArmA 2 DayZ mod.

Elder Scrolls MMO will be the first MMO game by Bethesda, and will, as the title strongly suggests, take place in the world of the Elder Scrolls series.

Ghost Recon: Future Soldier, a new instalment into Tom Clancy's Ghost Recon franchise, features stealth/cover based shooting from a third person perspective, and has many new interesting technologies, such as spy drones to mark targets, cloaking devices, and seeing through walls.

Skyrim - Dawnguard, is the highly anticipated DLC for Bethesda's newest instalment in the Elder Scrolls series. This DLC adds crossbows, vampires, werewolves, new quests, new shouts, and a new area. While this DLC isn't any horse armour, it does add a new skeletal horse.
 
 In conclusion, this has been my short summary of E3 2012, I haven't included everything, but I don't think anybody's going to read this anyway, and I got all that's important.

P.S. videos will come eventually, don't worry! Just working out some issues.