The new Fate/stay night film will be following Type-Moon's Unlimited Blade Works storyline. According to ANN, this will be revealed in the upcoming issue of NewType. Now we know that the film has a date of January 23, 2010. On that day, it will kick off in about a dozen or so theaters in Japan.
Studio Deen will be on the project, and it seems that the whole voice cast from the anime series Fate/stay night will be returning for the movie. I'll leave it up to you to decide if the former is a good thing or not.
Wow, we've come a long way since the original eroge, haven't we?