Today we announced Roku OS 9.1, making the streaming experience even simpler and more enjoyable. Roku OS 9.1 is expected to roll out to current generation Roku streaming players over the coming weeks. Besides various performance improvements and fixes we also introduce two new features in the UK:
This feature is perfect for your next house swap or for short term rentals. When enabled on a Roku streaming player or Roku TV, Guest Mode enables visiting guests to sign in to subscription channels using their own account credentials. Guests can specify a date on which their credentials will be automatically removed from the Roku device. To enable Guest Mode, go to Settings > System > Guest Mode.
Guest Mode can also be switched on and off remotely from the My account page on Roku.com. On Roku.com users can also remotely sign a guest out if the guest left early or accidentally selected the incorrect sign-out date.
Automatic Account Link
Makes subscription streaming on multiple Roku devices with the same account easier for users. If a customer has already logged in to a supported subscription service on a Roku device, they will not be required to re-enter their credentials when launching the same channel on an additional Roku device.
This feature is now available to developers and publishers to integrate into their channel. Streaming channels are expected to integrate support for Automatic Account Link shortly.
Source: Official Roku Website