Each PR review has three outcomes according to the documentation.
https://help.github.com/articles/about-pull-request-reviews/

• Comment:

• Approve:

• Request changes

Right now, I can only see the review comments using this code with your API
request.listReviewComments().iterator();
Can I see the "Approve" and "Request changes" as well? Do you have a plan to add them?
@kohsuke