GPRename 2.6.6 is available but I just made some clarifications modifications everywhere. There's a new nautilus actions script, last one was the old version. I made some changes to the website and modified a few things on sourceforge.
I was about to start adding a new feature but even after all these years the documentation of gtk2-perl hasn't improved which reminded me why I don't code gprename anymore. And unfortunately I don't have much time right now to start coding a new one in another language, it will have to wait.