The firmware released on Apr 7, 2016 does correct the RTH issue for the Phantom 4, but the issue is still present for all other aircraft types. From DJI on why this firmware release did not contain the fix:
The background is this firmware release also wasn’t planned and primarily addressed a security enhancement we wanted to push out ASAP (and didn’t need all the normal flight control testing). With the exception of some minor issues, firmware for flight control, camera etc weren’t updated to the next major release (which is still under testing - and has been for a while) where the issue below is fixed. The “planned" firmware release is currently the end of April.