To be honest, this is kinda non-news. 2 series were announced last year, this is just "we've got our arses in gear and the contracts are in place" I think. Doug Naylor and Robert Llewellyn have had a bit of back on forth on twitter lately before it was confirmed that made it obvious, then Craig was on the radio and it "just slipped out".
Apparently they're hoping to do it in front of an audience. Which is a good thing.