I got my update on 2/28. Hardware version NFGL, Software now 19.49.13, Maps version 17Q4. I'm not sure where it started since I forgot the magic incantation to find the version. (Was in ND when it prompted for update.)
Apparent differences:
1. When running Maps navigation in Android Auto the volume is much lower than before. Maybe it remembers your setting too (instead of defaulting to 14), not sure, will have to run it again.
2. The current radio preset used to be highlighted in red, now that is not present at start or when you switch off the Radio screen. If you select a preset it will turn red until the screen is changed.