Steven Soderbergh has been doing his frantic last-minute editing of Che at Post Works, a Soho facility on Varick. (“The best in the world for film and video post-production…no one compares. For real.” — Bob J.) A magazine editor told me over lunch a couple of days ago that he’s spoken to a Che guy who wonders if they’ll finish in time for the Cannes screening on Wednesday, 5.21.