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Isn't the fact that you're connecting to the TV through an HDMI port mean it is limited to duplication?

edit: Also, from what it seems like, it's a single-player device.  Which means that there's absolutely no asymmetrical gameplay with this.

not necessarily, I have a laptop and can use a TV as a seccond screen via HDMI there is no technical reason why this couldn't as long as the software supports it. 

mmmm, sadface :(

You say "a second screen" but I do not think "extend" is quite a second screen.  

Looks ugly as sin, but it is interesting. That touch screen is sort of weird, playing touch only games on it would be highly annoying. I won't buy it until it gets some cool non-phone games. Maybe with the Ouya coming out too people will create interesting android games.

Hell nah!

10:00 PM - Jensen plays for some time while the engineering guys work on getting the demo going..

“It’s the culmination of five years worth of work,” Jensen says,

Shield makes a connection to a gaming PC and is streaming Need for Speed. It’s going from the PC to Shield to the big screen. Tires are screeching. Cars are swerving. Flashes are popping. The latency is so short it’s like a gaming console.

9:57 PM - “So, this is Android the way it’s meant to be played,” Jensen says.

But it turns out, this also works with PC games. “The PC Untethered,” his slide says.

Valve’s STEAM service, with its 2,000 titles, is growing like crazy. And its Big Picture interface extends the PC to the big screen. But the question is, how does it get there?

Shield has a third tab that lets you play PC games. The PC demo is struggling a bit right now. It’s not coming up on the screen….

Ahhh, but now it works….

9:51 PM - He brings on the CEO of the game company that created Hawken to play in a competition against NVIDIA’s Jason Paul, who runs the Shield business.

Jason sets him up and they’re going after each other, each on their own Shield device. Lots of explosion, fires and shooting. The crowd’s digging it.

9:49 PM - “4K video looks pretty darn good.”

But by touching the device’s Shield button, gaming options come on screen. He’s driving a 4K display playing the game Blood Sword off of the Android store. Next up is a boxing game that comes up. “That’s enough of that,” Jensen said.

What else can it do, Jensen asks? Multiplayer games is one thing.

9:45 PM - He shows now the first time a 4K video comes off a mobile device onto a big screen. “No way,” shouts someone in the audience.

9:43 PM - All of your apps, all your contents, all your games just show up on the device.

He sits down in a living room setting on stage, hooks it up to a 4K LG television. He shows how the controller lets you enjoy music – he plays Alicia Keys, singing This Girl is on Fire.

Now, he’s showing how it plays movies.

H shows it with Facebook, of course.

Meet Project Shield.

9:42 PM - Jensen holds Project Shield in his hand. Flash bulbs are bursting all over the room.

9:40 PM - So Shield is the first implementation of the Tegra 4 processor. It’s packed with batteries giving 5-10 hours of gameplay; if you’re watching video, it gives 24 hours of play. It has a great sound system that uses a bass reflex system that extends its low-end frequency capabilities – it has twice the capability of an HP laptop with Beats audio. It has a console-grade game controller, with great buttons, joysticks, bumpers and the rest.

http://blogs.nvidia.com/2013/01/live-nvidias-ces-press-event/

Holy shit 4K video playback that is impressive 

There are PC games that support it for a dual screen experiance http://www.bit-tech.net/gaming/pc/2007/02/16/supreme_commander/4

I don't see what windows software limitations has to do with this anyway.

It'll be cancelled before official release, just like that other device thingamajig.