Interoperability with Premiere Pro
You can select a whole sequence in Premiere Pro and send it to Audition. When you use this feature, Premiere Pro generates high-quality intermediate files for every clip in the sequence and links them all with an XML file that Audition can read. Premiere Pro can even render a DV-quality video file, so you can compose to the pictures inside Audition.
After you've completed your mix with Audition, you can send it back to Premiere Pro, either as a mix-down or as multiple stemsone audio file for each track. This isn't quite the same as the dynamic-link relationship between Premiere Pro and After Effects, where you can jump between the applications and see the results. Also, there is no ASND file format now, but if your workflow allows for "picture lock," you'll be in heaven. And did I mention that Audition supports Open Media Framework (OMF)?