We have chosen to continue to build on PDK as the future direction of Puppets developer tooling and to archive Puppet Content Templates (PCT) and Puppet Runtime Manager (PRM).
These projects provided valuable lessons which will be fed into PDK 3.x
The full details of this approach can be found discussed in the blog
https://www.puppet.com/blog/faq-puppet-developer-kit-pdkIf any part of the community wants to adopt these projects for their own use please let us know.