Ars rounds up the new features in the forthcoming release of the Adobe CS4 suite to be released sometime next month. I think I'll have to upgrade for the multipage docs in Illustrator alone.

Photoshop CS4

* GPU-based drawing of documents onscreen
* 64-bit for Windows
* Expanded 3-D paint, lighting and rendering tools

Illustrator CS4

* Multipage documents with different sizes
* Indesign-style separations preview
* Many updated tools like gradient and blob brush

Indesign CS4

* Live Preflighting
* Easy Flash document creation
* Smart guides and spacing tools

Flash CS4

* Powerful Animation presets
* H.264 encoding
* Expanded 3-D transformation and object support with inverse kinematics and bones