We've just posted a new plug-in SDK to the DevNet site. The headers are up-to-date with the latest CC 2015 (9.0.1) release, there are new and updated sample projects, and the PDF documentation describes what has changed since the previous SDK release. The download page has an abbreviated list of these changes.
That's great news. Thanks Zac.
Hey Eddie, great to hear from you. Hope all is well!