This evening I noticed (a few days late) that phpBB 3.0.7 has been released.
I did my normal thing of upgrading, only to find my forum was trashed. Luckily for me I had a backup (file system and database) of the forum and with a little tweaking it was all restored, then upgraded again.
Bye the way, there was nothing wrong with the upgrade process itself. I just made a mistake during it.
Another reminder that one of the most important things you have is your backups!