I did wonder at first if the whole repeating cycle thing in the RDM series was their attempt to find a way to have the original series possibly be some part of that universe, but as the series it became pretty clear that wasn't the intention.
My take on the "Happened before, will happen again" meme was that they were all part of a computer simulation written by Baltar and Six (or the "real world" versions of Baltar and Six). The simulation is re-run with different initial parameters, always following similar trajectories.