BSG Executive Producer David Eick, talked to Nephele Tempest of Sci-Fi Wire about season 4.5 getting longer:
The second half of the fourth and final season of SCI FI Channel's original series Battlestar Galactica promises fans a number of extra-long, jam-packed episodes as it works toward the climactic finale, executive producer David Eick told fans at Comic-Con International in San Diego on July 26.
In a subsequent interview, Eick told SCI FI Wire that producers have been "able to convince the network to let us air ... long episodes--[to] take single episodes and make them double episodes, ... [and to take] double episodes and make them quadruple episodes."
Eick added: "Our episodes are always ... long, and we're constantly getting into the editing room with 10, 15, sometimes 20 minutes of material that you can't get into an episode." With just a half-season remaining, Eick said, "the story has become so critical in order to realize the arc of the series that we can't just cut stuff out and save it for later or push it 'til next year, the stuff we're used to doing. It's all got to be there."
So perhaps Eick means that some regular episodes will run a few minutes longer than usual and be super sized. We already know the original intention was that the Series Finale would be a 2 hour episode, that has since been expanded to run for 3 hours. But, the Final Episode was so epic in production, they have enough material to make it a 4 hour finale. We already know from Maureen Ryan's interview with Ron Moore that the Final Episode will be longer for the DVD version than what will be aired on TV. Unless, Sci-Fi has agreed to have it run for an additional hour.
To recap: Originally season 4.5 was going to be 10 hours. Then by adding a 3rd hour to the Final Episode it grew to 11 hours. So, if the Finale gets a 4th hour to air, we'll be seeing 12 hours of 4.5, hopefully if all this works out with the Sci-Fi Channel.