V For Vendetta, based on Alan Moore's seminal graphic novel, is out in cinemas on March 17, but the second trailer is online now here(for Quicktime High Definition) or here(for normal Quicktime).[
The story is set in a post-apocalyptic England, where a fascistic government has taken control and repressed the population. A masked vigilante, V (Hugo Weaving), rescues a young girl called Evie (Natalie Portman) and begins a war against the government.
There is also a virtual reality tour of the sets which you can take here.