Microsoft had rolled out a new test build for Windows 10. As well as the expected bug fixes (and new bugs), there are some new features, including some nifty three-finger gestures for touchpads.
Microsoft’s announcement post outlines the new gesture options:
3 finger up -> Task View
3 finger down -> Show Desktop
3 finger flick to left or right -> switches to previous app (go back 1)
3 finger move left or right -> Alt-Tab (Task View) pops up and you can select the app you want (remove fingers to select)
3 finger tap -> Search
Other additions include the ability to hide the search and task list buttons on the taskbar. Hit the link for more details on what to expect from the new build.
New build available to the Windows Insider Program [Blogging Windows]