According to Blastr, this word on the new Canadian spin-off Primeval tv series:
Canadian Primeval Spinoff to be Darker, Scarier, and Crossover-ier
I'm not sure what this means in terms of the series being "scarier" and "darker" and all, but this certainly has potential, and would appear to make the series more North American in feel that British, methinks. That's not necessarily a bad thing, as the series will likely be made to appeal more to the North American audience in taste, but I always thought that some of dinosaurs and other creatures encountered in the Brit series were pretty terrifying, just not portrayed that way at times.
As for the business of there being a crossover from the UK series in the first episode (presumably the pilot), that leads to all manner of interesting conjectures about which cast member it might be. There are certainly some obvious candidates, I expect, but to be honest, I don't know whether it couldn't be someone from the first series of the Brit show. Hopefully, we'll be hearing some casting news sooner rather than later.