New features on mission planner include easier mission scripting with right click options which lets you select the kind of action to trigger. Also the waypoint radius is shown which allows you to see how close your UAV needs to be before the waypoint is considered to be reached.
The new version of APM 2.23 has been released with an updated version of the mission planner. The new version mainly fixes minor bugs. The main new feature of APM 2.23 is the introduction of differential ailerons/flaps. The mission planner updates fix some issues and improve board detection speed. Read more for full details.
AMP is constantly being updated almost on a daily basis, however there have been a few new features that stand out
A new version of ArdupilotMega has been released which fixes many bugs. Primarily a bug that was recently found on the magnetometer has been fixed, as well as several minor navigation fixes. MAVlink comunications have been improved in terms of start-up speed and reliability