See this article from the Express (U.K.) website, reporting on the wrap party for the final episode of Hercule Poirot, starring David Suchet. I'd guess we'll see the episode on PBS Masterpiece Mystery next summer.
We have watched Agatha Christie's little Belgian detective over the past two and a half decades. While several women have played Christie's Miss Marple, Suchet is the definitive Poirot.
Speaking of Dame Agatha, has anyone filmed her short stories featuring the mysterious Mr. Quin and Mr. Satterthwaite? We have those eldritch stories on CD as read by Hugh Fraser. We listen to them in the car on longish drives - very pleasant.