The new Material Components for the Web have been published by Google last week and the code base for the WordPress Material Design Starter Theme has been updated to include the new components.
Head over to https://them.es/starter-material to see the new theme in action and feel free to generate your customized WordPress Material Design Starter Theme there.
A short changelog can be found in the Support Forum.
The new Starter Theme v2 is recommended for all new Theme developers as v1 is now deprecated and will not be updated anymore. The old Starter Theme using Material Design Lite can still be accessed on GitHub in the v1 branch.
If you have questions on the new Starter Theme feel free to submit a request under https://them.es/support. Material Components related issues should be reported in the Material Components repository.