1) As rumoured before Windows 8 Explorer will have ribbon UI. As you can see from the below picture, its ribbonized.
2) According to Manan, Windows 8 is going to have “Chatter” a unified voice & IM application built within the OS itself. It will be cool to have an application that allows you to IM or call an user from Skype, Windows Live Messenger, Yahoo and more. More details on it here.
3) There was no mention of Zune service on Windows 8 yet. Also Zune icon/tile was missing from the new immersive start screen.
4) OEM Activation 3.0: Microsoft during its COMPUTEX demo said Windows 8 will feature OEM Activation 3.0 technology that enables end-users with seamless activation experience. more details on this here.
5) Still no word on Silverlight as development platform on Windows 8. Sinofsky just confirmed that Silverlight will run inside IE10 browser which we all know.
I’ll update this post with more details as I find more info around the web.