I could be wrong, but I could have sworn that The Digital Bits once mentioned that the studio (Warner I think--and hope!) was planning this for later this year.
Of course, I'm relying on my sometimes imperfect memory here, so don't take this as a definite.
Of the three filmed versions of Hamlet I've seen (the others being Zeffirelli's and Olivier's), Branagh's is by far my favourite.
How bold was it to film the entire text as a 4 hour film (not one moment of which is not captivating) and to cast people like Jack Lemmon, Billy Crystal and Robin...