https://musescore.org/en
https://musescore.org/en/node/363741
An overview of the important highlights:
https://www.youtube.com/watch?v=ZrAZ_dK5miA
A new main feature are sound flags.
Other maybe interesting points from the video: There seem to be other sound libraries coming - maybe more Muse sounds or third party vendors (that might happen at some point). They are really expanding on the whole collaboration front, this is exciting too see and is clearly only the beginning so far.Sound flags appear as a 'speaker' icon to the left of Stave Text elements. Clicking this icon reveals a list of playback options that can be used to control an instrument's sound from that point onwards in the score.