I'm guessing "Clocks" will be aired shortly after, with "Murder on the Orient Express" and "Hallowe'en Party" released during the new year, January/February 2010.
As for Miss Marple, two more productions are expected this year, with Julia McKenzie reprising her role as the charismatic Miss Marple. The Secret of Chimneys and The Mirror Crack'd from Side to Side.
Still need more? Gore Verbinski (Pirates of the Caribbean, Prince of Persia) is set to direct a remake of CLUE, based on the murder mystery board game for Hasbro and Universal. Get ready for larger than life characters and hopefully a fun cast of actors who don't take themselves too seriously. If you can't wait that long, try out the 1985 original starring Tim Curry.