Speculation ahead.
My belief: The show is going to get dark. Really, really dark. As in, torturously dark, even more grim and gutwrenching than it already is, in order to make the ambiguous ending seem uplifting. (Vague comments from inside the production suggest the cast loved the script for the final episode.) This, I think, can be expected. How it will be accomplished, though, is what we’re waiting to see.
So here’s the speculative part, not based on anything concrete other than the above:
We’re not done with the events we’ve seen, but it’s not just more political machinations, and arguing about who gets to be in the Quorum now; this was a near total collapse of civilized governance, and a wrenching, primitive panic. The fleet begins to come apart at the seams. Two or more factions form – those loyal to Roslin, those loyal to the mutineers, those loyal to Zarek (I distinguish the latter two as being “anti-Cylon” and “entirely self-interested,” having formed a temporary marriage of convenience which may or may not still be relevant), and perhaps the Cylons separately. All are horrified at the outcome of the mutiny, but divisions are deep, and none are willing to lay down arms and make peace. A schism forms, or several. Part of the fleet buggers out: if we’re no longer looking for Earth, if anywhere good is good enough, and if you-all no longer pretend to have the answers, then frak you, we’re history. Some go back to the original colonies, perhaps to sue for peace, or perhaps to resume the fight; others head off into the black, hoping to stumble over a planetary oasis. Upon which some or all of them run into Cavil’s forces, and are butchered. Roslin’s whiteboard count: down to 15k or fewer. Thus is the stage set for the finale, whatever it might be.
So that’s one possible route, moving forward with the story instead of going back over old ground. Bottom line, however all of this develops, you know it’s going to be intense and seriously, seriously bleak.