New Group Policy settings in Windows 8.1 Update

As there’s no official list yet here’s my own. I dug it from the ADMX-files.

Let users turn on and use Enterprise Mode from the Tools menu
        This policy setting lets you decide whether users can turn on Enterprise Mode for websites with compatibility issues. Optionally, this policy also lets you specify where to get reports (through post messages) about the websites for which users turn on Enterprise Mode using the Tools menu. If you turn this setting on, users can see and use the Enterprise Mode option from the Tools menu. If you turn this setting on, but don't specify a report location, Enterprise Mode will still be available to your users, but you won't get any reports.If you disable or don't configure this policy setting, the menu option won't appear and users won't be able to run websites in Enterprise Mode.
     
Use the Enterprise Mode IE website list
        This policy setting lets you specify where to find the list of websites you want opened using Enterprise Mode IE, instead of Standard mode, because of compatibility issues. Users can't edit this list.If you enable this policy setting, Internet Explorer downloads the website list from your location (HKCU or HKLM\Software\policies\Microsoft\Internet Explorer\Main\EnterpriseMode), opening all listed websites using Enterprise Mode IE.If you disable or don't configure this policy setting, Internet Explorer opens all websites using Standards mode.
     
Prevent the usage of OneDrive for file storage
        This policy setting lets you prevent apps and features from working with files on OneDrive.If you enable this policy setting:* Users can’t access OneDrive from the OneDrive app and file picker.* Windows Store apps can’t access OneDrive using the WinRT API.* OneDrive doesn’t appear in the navigation pane in File Explorer.* OneDrive files aren’t kept in sync with the cloud.* Users can’t automatically upload photos and videos from the camera roll folder.If you disable or do not configure this policy setting, apps and features can work with OneDrive file storage.
     
Prevent OneDrive files from syncing over metered connections
        This policy setting allows configuration of OneDrive file sync behavior on metered connections.

Save documents to OneDrive by default
        This policy setting lets you disable OneDrive as the default save location. It does not prevent apps and users from saving files on OneDrive. If you disable this policy setting, files will be saved locally by default. Users will still be able to change the value of this setting to save to OneDrive by default. They will also be able to open and save files on OneDrive using the OneDrive app and file picker, and Windows Store apps will still be able to access OneDrive using the WinRT API. If you enable or do not configure this policy setting, users with a connected account will save documents to OneDrive by default.
     
Show Windows Store apps on the taskbar
        This policy setting allows users to see Windows Store apps on the taskbar.If you enable this policy setting, users will see Windows Store apps on the taskbar.If you disable this policy setting, users won’t see Windows Store apps on the taskbar.If you don’t configure this policy setting, the default setting for the user’s device will be used, and the user can choose to change it.

PS. There are some policies related to Japanese language that are not here…