This week I've been watching [[WP:VPT]] and copying relevant issues into bug reports on Bugzilla. You can see the reports here: https://bugzilla.wikimedia.org/29876
I would like to make these bug reports more profitable, though. As Brion has said (http://en.wikipedia.org/w/index.php?diff=454166570), we don't really have good acceptance tests to ensure that we produce consistent behavior with each release.
To begin to solve this, please help me tag relevant bugs "need-unittest" or "need-parsertest" and then look for that tag and help write tests.
If we do this right, the 1.19 release will be a *lot* smoother.
Mark.