Have just completed upgrading my laptop to Build 10056 and as expected the upgrade was flawless. Project Spartan is present but appears to only be accessible via the Start Menu, and is NOT the Default browser. IE is pinned to the Task Bar and very prominent.
Same Background, however there is a New and Highly Improved Recycle Bin where it is always parked!
There is a new Notification dialog box which I find attractive and is loaded with information.
The Start menu is height adjustable
and here is the all new Lock Screen