Yes, Adobe released the final feature improvement for Adobe Muse on March 26, 2018. They will continue to offer technical support to all active Creative Cloud customers until May 20, 2019. No new features will be added to the program beyond critical operating system updates.
While we are saddened by this news, we are happy to continue building and supporting widgets, tutorials, and templates for Muse. Our Muse For You community is extremely important to us, and we are proud to offer you the tools you need to bring your creations to life.