I want to know what the martians did with the proto molecule.
I want to see what happens to the creepy undead children.
Total necro-post here, but, ehhhh... don't care
I wanted to know the answers to all this shiz too, so I actually started reading the books a couple of months back. I'm just slightly over halfway through book 5 at the moment and I really can't wait to get into totally uncharted waters with books 7-9.
Despite having watched all 6 series from start to finish (twice - not something I do often), I'm absolutely loving the books. The ultimate destination the books end up at is more-or-less the same as the individual seasons (although some of them sort of blend into each other a bit), but sometimes the journey to get to that destination is slightly different. Some characters are very different too, with throwaway characters in the books having much bigger arcs in the show and vice-versa. Drummer for example, has only just been introduced in book 5. Her arc from Seasons 2 3 and 4 is shared between a couple of different characters. Bull from Season 5 has an awesome hero arc in an earlier book. Ashford is a far more unsympathetic character in the books than the series, where he actually went on to become a genuinely cool character. Book Ashford is a bit of knob. Havelock gets a far bigger arc in the books.
Anyway, what I'm basically saying is, if you loved the show, you should definitely give the books a try. They're like really easy reading hard sci-fi.