So MS just released another build for us to try
It doesn't have everything they showed in the tech demo, but it does have quite a lot of new features.
Been playing with it since yesterday and as far as design goes, I'm impressed. Just like in the older build, the startmenu isn't fullscreen (although you can maximize it), the installation was quick. I see a lot of new graphics elements on the desktop - namely the Cortana Window. I think it's a great idea to chat with Cortana, rather than using voice. It's a little bit like Siri but doesn't have as many features yet. It's going to be awesome once they expand it to more applications and add Cleverbot-esque AI
Another really cool addition is the Notification Center, perhaps not as nice looking as in my UI concept, but very handy. It has similar toggles that you can find on Android, Windows Phone and iOS.
I liked the Xbox Music app, but I'd prefer something where I don't need to sign in with my Live ID...
A few annoying things: No Spartan browser and everything felt a little sluggish and buggy at times. For instance, you cant resize most of the modern app windows beyond a certain point, and the startmenu has a lot of empty space if you unpin the apps. There are also a lot of functionality issues I've heard.
Overall, I think we're going in the right direction. I'm very excited to see what Windows 10 will be like as a final product
Certainly an improvement over 9841
If you're using Windows 10 TP, you can update to this build from the windows update.
For all others:Download Windows 10 build 9926: x86 | x64
Comments are welcome!