The studio hasn't formally announced these yet, but pre-order listings at Amazon.ca
(the Canadian branch of the big e-tailer) show that August 14th
is the planned release date of Poirot - Series 6
on DVD (CA$52.99 SRP) and high-def Blu-ray Disc (CA$84.99 SRP). No details are available yet, nor package art, but please stay tuned for updates!