It would be nice to see comments made on particular commits in the pull request file view.
Our workflow is: Create pull request incorporating commits. Add comments to the pull request (line-by-line). Address comments in new commit, add new commit to pull request.
But then if the reviewer wants to comment on the changes in the commit, those comments don't show up anywhere in the pull request (neither the activity stream or the file viewer). And there's no way to see changes relative to the last commit in the pull request directly. So there's no way to comment on just the changes made since the last review.
This feature would really help smooth out our workflow.