WinFuture says that Cortana for Windows 9 will offer support for reminders, including location, time and people information, and that it is also likely to be included in the default Bing search application. The virtual assistant will probably be able to respond to various questions, just like the Windows Phone version, although a video demo of it isn’t available yet.
The Notification Center is similar to what’s available to Windows Phone users, with all notifications appearing in a new window on the right side of the screen, in a list that includes notifications from various apps, but also system-related notifications.
The multiple desktop feature is similar to what Mac users already have at their disposal in OS X, allowing Windows 9 users to set up various desktops and assign certain apps to those particular working spaces. As the second video below shows, users can quickly add multiple desktops, and delete extra ones with similar ease. A special “Task view” button opens up a multiple desktops view section that takes up the screen’s bottom (horizontally) while on top of the multiple desktop strip the apps assigned to each desktop appear.
Information courtesy of http://www.bgr.com