Even though the Shield Tablet is NVIDIA's new baby, the venerable Shield Portable has not been forgotten. This device is getting update v99 today with a few tweaks and improvements. Hit your update menu to grab it.
Here's the changelog from NVIDIA.
Improves battery drain when SHIELD portable lid is closed
Updates the latest SHIELD hub app available on Google Play Store
Fixes a bug that does not allow videos to be played from Facebook, using Browser or Chrome, or on the YouTube app
Fixes a bug to enable support for 4K content in Console Mode
The update weighs in at a heft 480MB. The idle battery drain improvements are probably the best aspect of this update. Although, that video issue was pretty annoying too. NVIDIA doesn't do slow rollouts often, so you should be able to pull the update right now.