We suspect that only the most well-heeled will jump at the chance, as CS4 shares the majority of tools with its predecessor. Perhaps more dramatic, life-changing alterations will come with the next Creative Suite. That said, time-saving tweaks to Illustrator and Flash in particular could lure professionals immersed in them to upgrade.
With CS4, Adobe aimed to unify the interfaces of more than a dozen applications, including Flash and other former properties of Macromedia. You'll see similar pull down menus for toggling among workspaces that you can customize, as well as Flash-based panels that nicely snap open and shut. Corporate design departments will find plenty of enhancements for their teams to share work more quickly.
Adobe continues to improve integration among the applications. After Effects, as only one example, can import Photoshop 3D layers and export content directly into Flash.
Options for working with high-definition video and mobile content expand too, with support for the latest formats as well as for making Adobe AIR applications.
Source: Cnet