Toyota officially announced today the world-premiere of the all-new 2011 Sienna minivan at this year’s Los Angeles Auto Show. The new vehicle will be revealed at the Toyota press conference which will be held on Wednesday, Dec. 2, at 10:35 a.m. at the Toyota exhibit space in the South Hall of the Los Angeles Convention Center. The Japanese manufacturer will also make available a video clip with the press conference on the Toyota website.