From The Telegraph:
Five new films, based on a mixture of novels and short stories, will go into production next year.
Suchet said: ''I'm more than delighted to be reprising my role as Poirot. It's been my life's ambition to bring this amazing canon of works to completion on ITV.
The new films include Curtain, which is Poirot's last case and sees the detective, immobilised with arthritis, call on his old friend Captain Hastings to help him as they return to the scene of their first ever case to try to prevent another murder.
And in an ITV press release:
ITV is delighted to announce that acclaimed stage and television actress Julia McKenzie will return to her role as Miss Marple.
Three Marple films including Caribbean Mystery have been commissioned from ITV Studios and Agatha Christie Ltd.
A Caribbean Mystery will be the first film to be shot during the summer of 2012 with two further films Endless Night and The Seven Dials Mystery produced during the autumn of 2012.