My last television job before I decided to take up working in genealogy full time was at Lion, helping to develop the format last year for this British version of the show, and the news is that the series is almost complete and ready to be delivered to the BBC in a couple of weeks time, most likely to transmit late summer/early autumn on BBC2. Having also bumped into a researcher friend of mine recently who is also on the show, I know that there are some good stories lined up, so hopefully it should be a good product, as the team at Lion know their stuff - they were responsible for the hugely successful "Days That Shook the World" series amongst others.
There's no advance material publicity released on it yet, but for a flavour, the American PBS website for the series is at http://www.pbs.org/opb/historydetectives/ .
Enjoy!
Chris