Microsoft has today released its first build of the Windows 10 Technical Preview, which includes the new Start Menu, windowed apps, Task View, and more. We've made a quick video demonstrating all the new features you can find in the new preview, and we plan on making more when new features are pushed out via new builds.
The Windows 10 Technical Preview focuses heavily on feedback, meaning Microsoft will prompt you to give feedback on a number of different things within the operating system. You are also required to join the Windows Insider Program if you wish to actually play with the build.
Below is our video of the Windows 10 Technical Preview, give it a watch if you're not planning on installing the preview yourself. We recommend you install this preview on a secondary machine if you plan on playing with it, because the build is very buggy, something which is demonstrated in the video.