The Three Musketeers in 3D was just announced to be released on September 1, 2011 in Germany! This is far earlier than the date of October 14, 2011 which is still being shown on IMDB for US release.
The German website is currently up and running. It features the trailer in German and a photo gallery.
The Three Musketeers has an all star cast including Logan Lerman, Milla Jovovich, Mads Mikkleson, Orlando Bloom and Christoph Waltz. Filmed on location in Germany, and produced by Summit Entertainment and Constantin Film DE, it is directed by Paul W.S. Anderson.