Enrollment in the Roku Beta Developer Program is now open for the Spring 2018 OS update. This OS includes various media updates, so developers are encouraged to sample their video streams on the firmware and help catch and firmware regressions before they ship to production. Specific details of these media updates can be found in our beta release notes, which are only accessible to users registered in the program.
First-time participants can enroll in the program by following this link: http://go.roku.com/dev-beta
Beta testers of previous firmware versions can re-enroll in the program here: http://go.roku.com/reenroll
As always, thank you for your participation!