A few of the expected changes are;
6 home screens, up from the current 3.
Different sizing for many widgets apparently 5 sizes for some widgets
Widgets for switching various functions like WiFi and Bluetooth on and off
A new status bar
More information on the lock screen
NFC for some devices
Microsoft apps like One Note with Word Excel and Power Point apps to come late on
The inclusion of the native Microsoft apps is the first for any non MS OS. I'm pretty keen to try them out.