Patience grasshopper…
Be careful for what you wish. The previous version of the Roku app was received quite poorly. There was much wailing, gnashing of teeth, questioning of parentage, and foul language when it was released.
The new Uno version is getting much better reviews. However, as it is still in beta, it is apparently not yet ready for prime time.
Let Plex work out the kinks with a limited release before rolling out to other platforms.
As far as updates for the current Android TV app, they are quite frequent. There have been nine updates this year, including five last month. You can follow the announcement thread to be notified when new releases are available.
