Just hours before the Xbox 360's newest dashboard update hits tomorrow morning (10:00 a.m. GMT), our friends at Joystiq noticed the list of movies available for Netflix Watch Instantly streaming has suddenly dropped. The culprit? Sony Pictures Home Entertainment subsidiary Columbia Pictures, flicking previously available titles like Superbad, Bad Boys, and We Own the Night over to "Not available on Xbox" status (curiously, SPHE movies are still available to all.) Word from the official Netflix blog cites "the ebb and flow" of what is available on license at any given time causing a few hundred titles to be "temporarily" unavailable on the console, while still open for streaming for other devices, with an eye towards licensing them for the Xbox 360 soon. There's no way to know what movies won't work until adding them to your queue, so when you find your Karate Kid trilogy watching time suddenly wide open for more Gears of War 2 or Left 4 Dead action, just remember you have Sony to thank.

[Via Joystiq & Multiplayer]