Looks like it will be an easier transition for those on windows 7 and previous versions with the Start button and the Metro apps won't have their own space like in windows 8, they seem to open up in just a normal window.
Got some features that are similar to OSX like Expose and multiple desktops.
If you want to try out the Preview of Windows, you can sign up here
http://www.cnet.com/how-to/where-when-and-how-to-get-windows…
Looks interesting. A unified system across phone and computer. The preview comes out tomorrow did desktop, unknown for wp8.