The film is being produced by Viktoria Petranyi through Proton Cinema, the company sheco-founded with Mundrucz.. The film is a revenge drama set in the Danube Delta in the future. It is about a man who returns home to attend his father's funeral. He discovers that his father may have been murdered.
Delta had to be delayed after the sudden death of the lead actor Lajos Bartok. A new actor Felix Lajko has been cast in Bartok's original role.
Philippe Bober's Paris and Berlin-based The Coproduction Office is selling and co-producing the title. The Coproduction office also represented Johanna (2005) which screened in Un Certain Regard in 2005.
Delta takes its place on the Coproduction office's slate alongside Ulrich Seidl's Import/Export and Roy Andersson's You, The Living.