Adobe is already starting to work on a new version of their creative suite package, called CS4. They already have a few betas out on their website. Only Fireworks, Dreamweaver, and Sound Booth CS4 are available at this time. Photoshop CS4 unfortunately is not out yet.
The new CS4 betas can be installed on Windows XP, Vista, and Mac OSX v10.4 or higher. See adobe's website for more details. The betas are time-limited software, so act now if you want to evaluate Adobe's next version of their Creative Suite software and not having to pay full price for the final release. Before downloading, you'll need to create an Adobe ID if you have not already.
Here are some links on where to find more information and downloads for Adobe CS4 products:
