The Charms bar is eliminated
Another unnatural aspect of Windows 8 is the Charms bar, which takes search, device access (printers, scanners, and monitors), sharing, and settings configuration out of the apps using them and into an independent element you have to call up each time you want it. This requires users to move outside of a Metro app for these common functions -- it's also unfriendly and unnecessary.
So Windows Red kills the Charms bar.
Instead, there are Search, Share, and Settings buttons standard in every app's control bar, both in Windows Red Pro and Windows Red Mobile. The Share button, by the way, extends the sharing notion from social apps and cloud storage to include printing, screen mirroring, and screen placement (on devices connected to multiple displays). Essentially, it absorbs the features of the Devices charm.
The Charms bar's PC Settings controls, which managed Metro-wide preferences, are part of a separate Settings app in Windows Red Mobile. In Windows Red Pro, the PC Settings controls not already duplicated in the Control Panel are moved to the Control Panel for a unified OS settings environment.