The OSGi Feature Model
The OSGi Feature Model, created in 2018, is meant to replace the Sling Provisioning Model as the primary way of defining and assembling Sling applications.
Compared to the Provisioning Model, the Feature Model is richer and more general, and might evolve into an OSGi standard. It has been created in Sling as that's its primary audience for now, but might move elsewhere as it evolves.
See https://github.com/apache/sling-org-apache-sling-feature for more information about the Feature Model.