the dark knight - the batman begins sequel was done shooting and in post production. 2 difficulties arose - their promotion for the release this year was focused on heath's joker character (but they still have time to heal the public's wound over the loss) and in one article there were some dubbing commitments that were not met. but it will still be released on time.
as for imaginarium - if im ryt ive read somewhere that some re-writes were made to have his role continued by introducing another character in his place.