Question: Granted, I'm happy that Battlestar Galactica is continuing for a fourth season, but why only 13 episodes?

Answer: The exact number of episodes is apparently in flux. "It has not been decided whether it will be 13 episodes or 22," BSG producer David Weddle told SyFy Portal. "We should have a decision on that soon." That would explain why Sci Fi, in its official pickup announcement, said BSG had been renewed for a "minimum" of 13 episodes.