Adobe will announce its Creative Suite 4 (CS4) versions of its popular applications. Adobe will webcast the announcement, if you are interested in viewing the web broadcast you can register here to receive a reminder message on the announcement day. The announcement is scheduled on September 23rd for North America and Europe, for Australia, Singapore and India it is scheduled on September 24th.
Adobe released early beta CS4 versions of Dreamweaver, Fireworks and Soundbooth in May 2008 excluding Flash and Photoshop. These CS4 versions will support both 32-bit and 64-bit versions of Windows according to Downloadsquad.
I have Dreamweaver CS3 and Photoshop CS3 installed, i am not sure what new features CS4 versions of these applications will bring to users. These applications already have ton of features.