The Start menu is back! Perhaps the average user's greatest complaint about Win8, the missing Start menu will be returned but will be supplemented with the presence of tiles that were found on the Win8 Start screen. A good compromise, in my opinion. Additionally, the Charms bar (which pops out from Win8's right side of the screen) is gone.
Microsoft "Edge" will replace "Internet Explorer".
Cortana will be Microsoft's equivalent of Apple's "Siri" for voice search.
There will be changes to the way "OneDrive" works but, to be perfectly honest, I've never met a customer that uses it.