Sadly I think that "Complete" really does mean complete. I really hope I'm wrong.
Any Civilization news released there, in my expectations, will only be for that silly MMO game that they plan on launching. Take my opinion with a grain of salt, but I have no interest in it whatsoever. Civ, to me, MUST be an turn based strategy game. I mean you can call an MMO Civ, but it would just be adding the title to a random noun, like Civ first person shooters, Civ golf, or Civ the cheeseburger.
They only gave us 2 expansions for civ 4 and now we have 2 for 5. While I truly hope they have a 3rd in the works (and there's no shortage of fan recommended ideas), I think they signaled its death with the most recent patch just improving a scenario instead of releasing more DLC (i.e. new civs wonders or scenarios). I feel its too early for them to announce civ 6 yet. I don't expect any information on it until at least 2015.
Again I hope I'm wrong and they announce another expansion with some cool new mechanic or reworked old one, like corporations or colonies done in a way most players would enjoy. Or even DLC, with new and creative civs resources units buildings etc. Sadly though, I do not see any reason to expect such nice things.