Join Teams work meetings from Microsoft Teams (free) and vice versa

Microsoft Teams (Free) users can currently join Teams for work (or school) meetings only as guests, which requires them to use a browser and results in a sub-optimal experience. The new feature rolling out will allow these users to join Teams for work (or school) meetings in one click, without being redirected to the browser or asked to fill in their name/surname. They will also be able to continue collaborating with the meeting organizer and other participants via meeting chat after the meeting.  The feature will work in the opposite way as well, so Teams for work (or school) will just as easily be able to join meetings hosted by a Teams Free user with one click. This is associated with Roadmap ID: 167326

The new meeting pre-join screen is rolling out

The new pre-join screen was announced in the admin center back in August, but should be rolling out these days.  

It will make it easier for the user to identify and select the method of connecting to the meeting, and to verify audio and video settings before entering the meeting. 

The "Background filter" will now open up the image selection panel from where the user can select their background.

This feature is changed globally, and there is nothing you need to do to prepare for it, but maybe update end-user documentation on the new behavior.