Some of the new features are:
Interactive design without writing code
Design sophisticated interactive content and create functional interfaces in new Adobe Flash® Catalyst™ CS5 without writing code. Transform your unique vision into compelling online experiences and deliver perfect project files to developers.
Extraordinary image editing
Use the Mixer Brush and Bristle Tips in Adobe Photoshop® CS5 Extended to explore lifelike, naturally textured painting. Add dimension to your imagery with 3D extrusions using Adobe Repoussé technology, and make precise image selections more quickly and easily with new Truer Edge selection technology.
Innovative vector drawing and painting
Quickly and accurately represent depth and distance using new perspective tools in Adobe Illustrator® CS5. Precisely control stroke width, arrowheads, and dashes. And use the new Bristle Brush to draw with the expressive quality of watercolors, oils, and pastels, but with the scalability of vectors.
Comprehensive reach of the Flash Platform
Realize your vision online with the capabilities of the Adobe Flash Platform. Use Flash Catalyst CS5 to design interactive content without writing code, Adobe Flash Professional CS5 to create free-form, expressive content, and Adobe Flash Builder™ 4 to develop rich Internet applications.
Interactive documents and presentations
Create memorable documents and presentations complete with interactivity, motion, sound, and video in Adobe InDesign® CS5. Enhance page layouts with rich media using new motion presets for easy animation creation. Take advantage of support for FLV and MP3 audio file import to engage and excite your audiences.
Work natively with pristine tapeless footage in Adobe Premiere® Pro CS5 and Adobe After Effects® CS5. Edit tapeless media formats using industry-leading tapeless workflows to keep from wasting valuable production time transcoding or rewrapping.
So quit reading about it and go and check the CS5 here