Bootstrap 4 has been published and it was about time to update the Code base for our first WordPress Starter Theme that has been built with Bootstrap.
Head over to them.es/starter to see the Theme in action. You can also generate your customized WordPress Starter Theme based on Bootstrap 4 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 can still be accessed on GitHub or downloaded via the Theme Generator.