In an interview with Peter Jackson over at Dark Horizons, Jackson stated there may be a 3-4 disc edition of King Kong released later this year.

Jackson: No, that's all been saved for, ... it depends on Universal making a decision, but they seem to be pretty, keen on the idea of doing a 3 or 4 disc release, towards the end of the year which would include deleted scenes and bloopers and a whole new raft of docos that would go a lot deeper into the technical stuff of the making of the film that we couldn't show in the production diaries.

To read the entire interview head over to Dark Horizons