Good overview by Benjamin Mayo of all the Apple apps that will have Touch Bar integration on the new MacBook Pros. Apple certainly had the time to build extensive support for the new API while waiting for the new Pros to ship.
That’s a total of 23 Apple apps that live in the /Applications root folder with Touch Bar support as of the current macOS 10.12.1 build. The following apps have no Touch Bar integration as far as I could tell; App Store, Automator, Chess, Dashboard, Dictionary, DVD Player, Font Book, Image Capture, Photo Booth and Stickies. I expect all of Apple’s apps to flesh out their Touch Bar integrations in future macOS update.
See also: Steve Troughton-Smith’s utility to grab a screenshot of the currently active app in the Touch Bar.