Back in 1999, Richard Hatch (who played Apollo on the original BSG and who plays Zarek on the new one) created a trailer for a proposed BSG continuation that would ignore Galactica 1980. For a long time this trailer has been unavailable online for legal reasons. Right now its on YouTube, but I dont know whether the legal obstacles have been resolved, so watch it now in case it vanishes.
Its interesting to see what Hatch had in mind and strange to see him looking halfway between his Apollo and Zarek selves in appearance. For those who only know the new series, the guy with the scarred face and creepy smile who says greetings is the original Baltar (played by John Colicos, who some may also recall as the Klingon Commander Kor from Star Trek).