I’m using Audition Build 11.1, and it does show sample rate and bit depth, but no bit rate, even when you go to the window to view additional properties. I was able to show the bitrate in Mpeg Streamclip, which states the bitrate at 317kbps, although no confirmation if Media Encoder is spitting out the AAC as CBR or VBR.
If you export audio out of Audition, it does it give you the option for CBR and VBR. So maybe worse case scenario, I’ll have to encode the video and audio separately, then mux them.