I have been struggling with PD-8 and sound sync with WTV imports. PD8 was usually fine with 1080 or 480 imports, but lost about a second of sync per hour with 720 content. With PD8, I had to split the audio and adjust the audio duration with powertools to bring it back to sync.
However, just completed a 720p import and sync was great. PD9 did pop up the 'which audio and video stream?' window for this clip.
When PD8 popped this up, it was an automatic lockup. PD9 did fine.
So, not sure if its ALL good, but much better!