1. This is incompatible with previous versions of FreeDV in that a completely different encoding scheme is now being used for the text field. In other words, if PSK Reporter is enabled (in Tools->Options), this version will be unable to decode any text sent by users running earlier versions.
2. As with earlier versions, both sides must have PSK Reporter enabled in order for FreeDV to properly decode the received text (and thus report the other person's callsign).
For reference, this build contains the following work:
Let me know if you have any questions or run into issues.