First off, the new 'Enhance Speech' feature is very effective! It cleans up my audio in one click - better than I could do myself in Essential Sound.
However, there is a common glitch I am running in to. When trimming clips for a piece-to-camera I'm working on, random parts of the interview start playing where I have made cuts. I assumed this was a render file/media cache issue so I've tried clearing it, restarting Premiere, restarting my machine. It is definitely related to Enhance Speech; when I delete it off the clip, the problem goes away. Great! I thought I could re-add the Enhance Speech effect, but the problem returns.
The first time I had this problem, I managed to find a workaround (I think by dragging the clip back into the timeline from source, re-applying Enhance Speech). However it is a stubborn little bug and I can't seem to replicate an easy fix.
Also, in general, there is a bit too much render time with this feature - every time I trim a frame or two off a clip that has already been rendered, it requires additional rendering to be able to play back my edit. I'm sure this will improve with time!
Anyway I hope I explained it okay - looking forward to using this great feature in all it's glory.