The name GadflyB5 came about while I was trying to distinguish the new releases of Gadfly from previous ones. A lot has changed since then, and I didn't want to run into the problems I had when I released the new RoundUp - people say "oh, I remember that, it was crap" and move on. Hence a newish name.
There's a bit of a traditional naming of re-releases like this - appending NG to the name, meaning Next Generation. Only problem is, I think Next Gen sucked, since Babylon 5 was a far superior show.
So there you go. Aren't you glad you followed that link? 