The release date for Miley's upcoming movie LOL will be April 22, 2011.
This is according to a couple of different sources, but I'm not sure how reliable some of these sources are. If this date changes I will try to post an update.
A trailer for the movie is also rumored to be released on February 23rd.
UPDATE: August 6, 2011.
August is here and LOL has not been released. No release date has been announced. I keep hearing late 2011, but that might even be pushing it.