Adobe Photoshop’s Project Manager John Nack addresses the crazy amount of rumors going on the net about Photoshop CS4 getting GPU acceleration in his blog post here.
Basically he states that everything you heard about the story is bull. GPU acceleration has not been promised for any version of Photoshop, much less CS4. Hell they don’t even have a release date for CS4 yet.
Sounds like the Windows people are dying for an answer to the GPU-accelerated pixelmator and acorn, but sorry guys, you unprivileged lot are not going to get something as beautiful as pixelmator in a million years, and certainly not on that 20-year-old shitload of code known as Photoshop. GPU-accelerated image editors are for the elites, like, for example, Mac users.