Adobe has finally allowed websites to post reviews and details about the up and coming update to Adobes Creative Suite.
Among the rumors to have been confirmed is a report by CNET that Photoshop CS4 would utilize GPU acceleration in order to perform certain actions / functions.
One GPU feature that has been missed out of Photoshop CS4 is "Pixel Blender" that would have allowed effects to be applied to images quickly, it has been stated by "John Nack" that this feature should be released as a free update by Adobe Labs in the near future.