Set 400 years in the future, Charlize Theron stars as Aeon Flux an undergound assassin with a mission. This is based on Peter Chung's great MTV animated series (this being the live action remake of the cult classic), and after watching the trailer I can only ask... why?
I dunno, if you wanna watch a live action, beautiful assassin running around with style and flair, check out Luc Besson's Nikita (not the crummy remake), and if you want to watch Aeon Flux, then grab the complete animated boxed set next month (available here) and watch it how nature intended!