All-star cast for new version
I'm really not a fan of the remake idea but it's fun to discuss, though. Especially with the modern all-star cast.
(Of course, movie would be set in the 1930s. No some modern BS with computers and iPhones)
Prologue/Flashback characters:
Colonel Hamish Armstrong - Christian Bale
Sonia Armstrong - Natalie Portman
Paulette(Susanne) - Marion Cotillard
Main characters:
Hercule Poirot - Kenneth Branagh
Bianchi(Bouc) - Tom Hanks
Dr. Constantine - J.K. Simmons
Ratchett/Casetti - Daniel Day-Lewis
Mrs. Hubbard - Cate Blanchett
Greta Ohlsson - Emma Thompson
Mary Debenham - Jessica Chastain
Colonel Arbuthnott- Michael Fassbender
Countess Helena Andrenyi - Rooney Mara
Count Rudolf Andrenyi - Aidan Turner
Princess Natalia Dragomiroff - Maggie Smith
Hildegarde Schmidt - Tilda Swinton
Hector McQueen - Ryan Gosling
Edward Beddoes(Masterman) - Ian McKellen
Antonio Foscarelli - Bobby Cannavale
Cyrus B. Hardman - Paul Giamatti
Pierre Paul Michel - Daniel Auteuil