Koen Defoort we just released a new version of Smart Remote software that now allows you to add Sonos Playbar, Playbase, Beam and Amp (added as Wi-Fi devices on Smart Remote) to a TV Scene. Please check out the release notes here.
The wifi speakers aren't available yes in AV Scenes. However, you can try to add your soundbar as an Infrared speaker, as you can control IR speakers in your AV Scenes. That should allow you to use it in an AV Scene.
Hi Koen Defoort For anyone who has a Sonos Beam, Playbar or Playbase, you can add it to a TV Scene after adding your Sonos as an IR device on Smart Remote. Here is how to add it via IR. Please choose the category "Speakers", location "North America", brand "Sonos", select "enter my model manually", enter your Sonos model number. You will then be able to add it to any TV Scenes.