I just found this article with an interview with Adrian Hodges, the co-creator and writer of Primeval.
The whole article can be found here."The third-season finale of Primeval left heroic team leader Danny Quinn (Jason Flemyng) trapped in Pliocene Africa, leaving fans to wonder whether he will ever return.
Hodges revealed that season four "will be starting a year later [from the end of season three]. All the cast you know will reappear, but they won't all necessarily reappear straightaway or for the whole season. However, we will be giving satisfying answers to all those cliffhangers."
Ok,so first of all... ACKKKKKKK!!!!! A whole year later? I had assumed maybe it would start a few days later.. showing Abby and Connor hold up in some cave or something before they discover Helen's Anomaly Opening Device. But no, we lose a whole year of *something* happening with Abby and Connor. He says questions will be answered, but I'm sure there will still be huge gaps. Thank goodness for fanfics!