It adds support for AFP and NFS. I have verified that the unit exports folders via NFS. It exports /mnt/data/public only in my testing. I was able to copy files to and from the unit. This is *nix style NFS, so your local username is used for file permissions on the patriot.
I did NOT test if the unit will migrate your data, I simply formatted some spare drives for testing the new firmware. I do not see any reason that users of R03 would have issues R01 and R02 users might lose data, but I have not tested.
root@ClusterHeadUnit02:~# showmount --exports 192.168.1.106
Export list for 192.168.1.106:
root@ClusterHeadUnit02:~# mount 192.168.1.106:/mnt/data/public /mnt/valkyriemount/ -o nolock
root@ClusterHeadUnit02:~# ls -l /mnt/valkyriemount/
-rwxrwxrwx 1 501 501 3901099 Jul 8 23:05 IMG_2159.JPG