As posted in several places, not the least of which is the Wellesnet message board, here are the official specs of the upcoming Arkadin Criterion DVD set:

SPECIAL EDITION THREE-DISC SET FEATURES
– New, restored high-definition digital transfers of three versions of the film: the Corinth Verion, Confidential Report, and a new Comprehensive Version
– Audio commentary by scholars Jonathan Rosenbaum and James Naremore
– Interviews with Welles biographer Simon Callow, star Robert Arden, radio producer Harry Alan Towers, director Peter Bogdanovich, and film archivists Stephan Droessler and Claude Bertemes
– Three half-hour episodes of the radio program The Lives of Harry Lime, upon which the film is based
– On the Comprehensive Version, a new documentary featuring Droessler, Bertemes, and Bogdanovich
– Outtakes, rushes, and alternate scenes from the film
– Extensive stills gallery
– Optional English subtitles for the deaf and hard of hearing