The Animatrix is basically a collection of anime shorts inspired by the Matrix storyline. I've read that the Warchowski brothers wrote scripts for about 6 of the 9 episodes that are to appear on DVD sometime in June or so. So, it should turn out pretty damn cool.
As for the topic: Ya, the "Final Flight of Osiris" is gonna be great. Combining the graphics of FF: TSW with the action and story of the Matrix series, it really can't go wrong.