It is being reported that the IMAX release of Half-Blood Prince has been delayed by two weeks, to July 29th; it was originally set to be shown in IMAX theatres the same day as conventional theatres in the US: July, 15, 2009. The reason for the change of date is as follows:

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The film will open in 35mm theaters on the 15th; however, it will not open in IMAX theaters until the 29th. Basically what happened is IMAX Corporation signed a contract with Paramount guaranteeing them a 4 week exclusive window if they filmed parts of Transformers 2 with IMAX cameras onto IMAX film (something that is quite a bit more expensive). Unfortunately that was back when Harry Potter was due to open November 2008 and when Warner Bros. pushed back the opening date Paramount was not willing to renegotiate the contract it had signed with IMAX.

We are currently awaiting confirmation from Warner Bros. on this news, so please stay tuned for further developments.

Source: Harry Potter Fan Zone

UPDATE: The Wall Street Journal has confirmed the news, adding that one IMAX in New York and another in Los Angeles, will play the film from July 14th. Thanks to HPANA for the link!