When will the next major Acrobat DC Classic Track base version be released?

The Acrobat release notes say:

Major release: A major, functional release with many new and improved features developed on an 18 month release cycle.

The last major Acrobat DC Classic Track base version was released on 6 April 2015. Now is 18 months later. Does any information exist when the next major Acrobat DC Classic Track base version will be released?