Note on episode numbering: There are 22 episodes in season four. The first two, officially, were used on the “Razor” movie. Therefore the first “actual” episode of season four was #3, and the cliffhanger finale in June was #12. That makes this one, even though it’s the 11th “actual” episode of season four, episode #13, according to official internal numbering. This, apparently, has proved extremely confusing to a lot of people, so the overwhelming majority of online references show this episode numbered as 4.11 instead of 13. This looks to be a break in practice; as of the finale, sites were maybe half-and-half using the “official” numbering versus the “sensible” numbering. The break, it seems, was long, and memories are short, so the “sensible” scheme now predominates on fan sites and such. Here, I was using the “official” scheme, so just to stay consistent, and to prevent confusion when looking up past threads, I’m going to continue with it. Just an FYI in case you’re comparing this entry to what’s shown on other sites.
Links to the last few discussions, if you’d like to refresh your memory:
4.8 - “Faith” (in which Starbuck’s crew finds the wounded basestar, and Roslin deteriorates in Galactica’s sickbay)
4.9 - “Guess What’s Coming to Dinner” (in which Starbuck’s crew returns with the basestar; Gaeta sings about his missing leg; the Cylons propose destroying the Resurrection Hub, and then immediately begin scheming to betray humanity while the humans do the same; Athena murders the Six Natalie; and Roslin gets “kidnapped” when the hybrid panics and jumps)
4.10 - “Sine Qua Non” (in which the disappearance of Roslin prompts a search for a replacement President, and erratic behavior from Adama; Cottle reveals that Tigh has impregnated Caprica Six during his “interrogations”; Lee is chosen and sworn in as interim President; Adama relinquishes command to search for Roslin; and the character of Romo Lampkin is made considerably less interesting)
4.11 - “The Hub” (in which Roslin’s isolated basestar crew, human and Cylon together, cooperate to destroy the Hub without the help of the fleet)
4.12 - “Revelations” (in which a mutually-assured-destruction standoff is resolved when Lee abruptly finds a compromise to achieve a tentative peace, and human and Cylon gaily traipse off to the now-known location of Earth, only to find it was turned into a radioactive cinder long ago)
Okay. So.
The wait is over.
This is the final stretch of episodes, heading toward our long-anticipated finale, during which all storylines will be concluded, all questions will be answered, and bridges will be sold to those who accept without complaint the preceding two assertions. 
Can’t wait, can’t wait, can’t wait…