The Radio Times announced its return and Official Poldark confirmed the news with this tweet, although the actual date is yet to be revealed.
Fans in the US will have to wait a little longer to see series three, however. Masterpiece PBS give the premiere date Stateside as 1 October.
NEWS: #PoldarkPBS returns for season 3 on October 1, 2017 on MASTERPIECE on @PBS! pic.twitter.com/Xe5uQjamHU— Masterpiece PBS (@masterpiecepbs) 4 April 2017
And what news of Series 4? Although it has not been announced Aidan Turner, in his recent interview with Dave Fanning, dropped strong hints of a September start for S4 - should it go ahead. Series 1, 2 and 3 all had four months pre-production prior to the start of filming. On that basis S4 will need to start in May. Let's hope for some news soon!