www.soundtrack.net has released its preview of Nicholas Hooper's score for Harry Potter and the Order of the Phoenix, due for release July 13th, although the score will be for sale from July 10th.
Listening to the mini-clips at www.soundtrack.net, this sounds like a highly accomplished score, which seems to mesh well with the mood of the original novel I feel. I especially liked the clips for the tracks: Professor Umbridge, Possession and The Ministry of Magic.
There's the usual reference to Hedwig's Theme by John Williams, without which no Harry Potter score would be complete of course.
Hooper is well-known for collaborating with director David Yates.