From Lucasfilm, straight from the announcement at Comic-Con:
MARION RAVENWOOD RETURNS: Actress Karen Allen is joining the cast of the upcoming "Indiana Jones" movie, reprising her role as spirited Marion Ravenwood, it was announced today during Comic-Con International in San Diego. The new movie is in production under the direction of Steven Spielberg, who is pictured here with Allen during a break in shooting in Hawaii. The upcoming "Indiana Jones" adventure is a Lucasfilm Ltd. production and is being distributed by Paramount Pictures. Frank Marshall returns as producer, with Kathleen Kennedy joining George Lucas as executive producer. It is planned for worldwide release on May 22, 2008. Breaking news about the new "Indiana Jones" movie can be found at http://www.indianajones.com. (Photo by David James, courtesy Lucasfilm Ltd.)