Sci-fi's website did mention a love interest for Starbuck, however they hinted that it would be someone from her past.
On another matter, It would be virtually impossible to exterminate the population of a planet with even a bunch of nukes. At least in the immediate term anyway. While in the long term, you could kill the population by rad sickness, and starvation/infrastructure loss. Plus, evidently the cylons want Caprica for some reason, maybe to populate with their cylon/human crossbreeds. It is after all their home to ya know.