Вот, собственно, все и решилось:
Katherine Heigl will return to Grey's Anatomy for Season 6, according to a statement from ABC. The news comes just hours after T.R. Knight's Grey's Anatomy exit was finally confirmed — by both the actor and series creator Shonda Rhimes.
ABC declined TVGuide.com's request for further comment from Rhimes (who did issue a statement on Friday regarding Knight's departure). Similarly, Heigl's rep said no statement was forthcoming from the actress.