Apple has unveiled iOS 6.1 for all iPhone, iPad, and iPod touch models featuring iOS 6.0. The main upgrade its that it allows LTE support for a brand new set of carriers for the iPhone 5.
iTunes will also now match compatibility with individual song downloads from iCloud. The 107 MB update will also include a button that will allow you to reset your Advertising Identifier and includes a set of bug fixes as well.
Source: SlashGear.com