does this mean that you are the only developer for this
At this point, yes he is.
But then, given that there hadn't been anyone working on GC2 at all for the last year or two (most of Stardock's game people have been working on Elemental), I'm just happy to have Brad still giving a little love to this excellent space 4x game.
What about a glactic civ version III ?
This is what Brad (Frogboy/Draginol) said in this thread:
"For those wondering about a future Galactic Civilizations III, right now, our plans for now will be to continue supporting the existing Galactic Civilizations II -- no GalCiv III is in the works right now."
So no GalCiv 3 anytime soon. I'm guessing it'll be at least five years before we see another entry in the franchise (if not more).