The speculation is finally over!
Official Poldark have announced that Poldark S2 is scheduled for Autumn 2016 in the UK and Poldarked has had this confirmed by Poldark's publicist.
Responding to an enquiry Official Poldark tweeted:
@madamyez There is no official release date yet, but it is scheduled to air in the Autumn of 2016 :)— Official Poldark (@PoldarkTV) November 7, 2015
There is no news as yet of air dates around the world, but we'll keep you posted.