They are done and have gone through editing without technical issues. We are having our QA team go through the series now to ensure that it can be followed and completed start-to-finish.
Our QA team is also looking at other 4.12 stuff with higher priorities, but this is on the list so I would expect it would be finished before official 4.12 release.
I will link to a blog post when they are up though.
-W
