It has been announced recently that the IMAX version of the newest HP film,
"Harry Potter and the Half-Blood Prince" has been delayed until July 29th, exactly two weeks after the film's planned release date alongside the basic version of the film on July 15th because, according to reports online, IMAX had already comitted to show the sequel to "Transformers" for another studio.
And that movie happened to premire only two weeks before the HP movie,
So, the IMAX version of "Harry Potter and the Half-Blood Prince" was pushed back.
The release date for the basic version of the film will not be affected in the slightest by the changed release date to the IMAX version.