How do I take a Screenshot of the new "Touch Bar" on the newer Macs?
Apple has released an update to the Grab application that allows you to capture the Touch Bar.



The Touch Bar is constantly dynamic in nature, so Apple added a "timed" capture for the Touch Bar so you can navigate to the App with the Touch Bar layout before the "grab" executes.

You can find the Grab application under Utilities.  ⇧ Shift⌘ CommandU and select Grab or use Spotlight (⌘ CommandSpace) and just start typing "grab..."