Early this morning, the Adobe Labs team released preview versions of three Creative Suite 4 applications: Dreamweaver, Fireworks and Soundbooth.
(Personally, I thought that Adobe might actually phase Fireworks out now that the program is being produced by the same company that releases that other graphics program, Photoshop. Guess I was wrong.)
The official announcement on the Adobe Labs site provides plenty of information on what the new versions bring, including a brand new interface, but does not, however, provide decent screenshots. So, here are some captures from Adobe Dreamweaver CS4: (click on the image for the larger version)

(Dreamweaver CS4 main window)
(CSS options dialog after selecting font…should make for quick and easy CSS maintenance.)
(Adobe Extension Manager CS4)
(Validation Checker)
Some of the notable new features for Dreamweaver include:
Live View - View your web pages under real-world browser conditions with the new Live View in Dreamweaver — while still retaining direct access to the code. The new rendering mode, which uses the open source rendering engine WebKit, displays your designs like a standards-based browser.
Photoshop Smart Objects - Photoshop and Dreamweaver integration has evolved to the next level of compatibility and functionality. Drag and drop an Adobe Photoshop® PSD file into a Dreamweaver page to create an image Smart Object.
Adobe® AIR™ authoring support - Create multiplatform desktop applications from your Dreamweaver HTML and JavaScript sites with new Adobe AIR™ authoring support.
Read more about the new releases over at Adobe Labs. Or, download the betas and give them a spin yourself. (Note: the trial period for beta testers is two measly days. However, if you already own a copy of the respective program [or the CS3 suite], you can test it for a tad longer.)