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Yup, the upcoming Fate Project movie is Unlimited Blade Works all right. The latest issue of Newtype magazine confirms it.
It also mentions that the movie will be animated by Studio Deen (responsible for the original Fate/stay anime as well as the ongoing Umineko no Naku Koro ni series), and directed and written by the same people that worked on the anime as well.
Unlimited Blade Works is set for a January 23, 2010 release.