The release notes included with the update read as follows;
"This update contains improvements and bug fixes, including:
LTE support for more carriers (complete list of supported carriers at www.apple.com/iphone/LTE/)
Purchase movie tickets through Fandango with Siri (USA only)
iTunes Match subscribers can now download individual songs from iCloud
New button to reset the Advertising identifier
For information on the security content of this update, please visit this website:
So far we have installed the update successfully on an iPhone 5, an iPad Mini, and 3rd Generation iPad with Retina Display.
If you have had any problems installing the update on a device let us know via the comments.