One of the most frequent questions I see on my Twitter page is "When will Season 4 of Peaky Blinders air?" The latest news, taken from recent interviews with Steven Knight and Cillian Murphy, is that filming should start on it in March 2107 (one interview with SK said April) with a view to airing it on BBC2 in October. This is likely to be the earliest it will air, given the time needed to film and edit it and it could end up being later. They say patience is a virtue ............. but then they probably didn't watch Peaky Blinders.
Read an interview with Steven Knight in the Independent here