From May 13 through May 20, the Roku Channel is running a promotion called "National Streaming Week." Over the course of the week, Roku will be featuring free content from premium channels like HBO, Showtime, and Cinemax, along with exclusive cable shows that aren't yet available on other streaming platforms.
Alongside this promotion, Roku is also running a giveaway for a Roku TV and wireless speakers, and offering a sale on many Roku models.
This will all be capped off at the end of May by the launch of Stingray, a free (ad-supported) Roku Channel-based service for streaming music videos.