when checking for the latest updates in Settings -> About Shield -> System updates, it's saying that it's up to date.
Android Version is 4.2.1 and Kernel built on Aug 26th 2013.
According to Nvidia, it's already been updated to 4.2.2: http://shield.nvidia.com/release-notes/
But why does mine say 4.2.1 is the latest update?
The Shield has never been modified or rooted, the box was still sealed when I got it.