It is currently hoped that the next Beta Test release of Poweramp v3 will be ready sometime in April 2018. For the latest update posted by Max the developer, please see http://forum.powerampapp.com/topic/10136-poweramp-v3-project-update-please-read-first-post-for-latest-info-before-commenting/?page=77#comment-46297
As you are probably aware, the Poweramp developer, Max, has been working hard on an updated material design user interface for Poweramp v3, which required a full ground-up