I too just logged in today and noticed the updated firmware from December, but am hesitant to update it again with 0 explanation of what if anything has changed.
For anyone that has done the upgrade (I did look at the NAS forum post, but not much info there either) have you noticed anything different? Is HTTPS usable from outside the local network? Has the PTZ on reboot issue been corrected? I'm losing hope that a real reliable usable firmware will ever come out for this model camera.