The US users are getting upgraded by another bug-fixing update for Asus Transformer Prime. The upgrade is bringing a new improved Wi-Fi and Bluetooth performing a new karnel for tablet.A notification is coming out on your prime to download and install the update.
If we get ahold on one the post will update without any official change-log, The built version is 220.127.116.11. The manual initiates the system update process. you can G to Settings> About Tablet > System update to manually initiate the update process.