There will be voices of James McAvoy, Hugh Laurie, Jim Broadbent, Bill Nighy, Imelda Staunton. And again I'm convinced that the incredible number of British actors were in "Harry Potter" movies, because Jim, Bill and Imelda were there.
P.S. I won't watch it in 3D.
Official movie website.
Release dates - November 11, 2011 (UK), November 23, 2011 (USA, France), December 8, 2011 (Russia), December 22, 2011 (Ukraine).