In his most recent two films (Face/Off & Mission: Impossible 2), Woo has moved a bit away from the themes/elements that made his reputation. In particular the elements of male bonding, friendship, sacrifice, and honor above all have fallen to the wayside. Instead, Woo has moved in an interesting new direction, and is working with common horror themes: the concepts of imitation and loss of identity. This is essentially uncovered ground for action film.
These two films interweave some classic Wooian elements (over-the-top action scenes, two-handed gun battles, slo-mo, and doves) with this new web of interchangeable faces and deception. It's not surprising that the writer of M:I2 took a great deal of inspiration from Hitchcock.