New
Reviewable will now automatically defer a review when published with unreviewed files or unresolved discussions. This allows you to post a partial review while visually handing off responsibility for the next action. This can be helpful when discussing larger design issues or other problems that need to be addressed before proceeding with the rest of the review.
Instead of displaying red counters for these deferred files and discussions, they'll now be gray with a red border indicating that there's still work to be done, but you're waiting for others to act first before continuing the review.
In addition to the visual differences, the review will fall from awaiting my action to being reviewed by me until an action is taken to change deferral state — either changes to files you're reviewing or new comments are posted. When this happens, the counters will reset to red and the review will be reactivated.
Note that you can continue manipulating a review as usual while it's deferred, except that Reviewable won't suggest the next set of diffs to review. If you wish, you can also reactivate a deferred review manually by clicking the continue review now button on the review page.

If you have a custom completion condition that computes pendingReviewers
from scratch, you'll want to read the docs to see how this change affects you.
As always, please don't hesitate to get in touch if you have any issues or suggestions -- we're happy to help!