Yesterday I was so excited to see my Roku Ultra as an option for screen mirroring on my iPhone. After using it for a little bit I went upstairs to check my 3921 and after updating that device I noticed it wasn’t available to screen mirror to!
I have the Roku Premier 3920EU, which has been updated to 9.4, but doesn't seem to include support for Airplay. Hopefully they are planning on releasing support for both devices within the next few weeks. Thanks for providing a link to the article.
Airplay was just installed on my Roku 3920EU. I used the settings menu to manually check for updates and a message appeared saying something along the lines of "Installing 'Airplay' channel". I have been using 9.4 build 4183-91 since Thursday.