Hi,
The report covering Wikimedia engineering activities in December 2014 is now available:
https://www.mediawiki.org/wiki/Wikimedia_Engineering/Report/2014/December
Also, note that the format of the report is changing. Consistently with the WMF-wide switch to quarterly reviews announced a few months ago ( https://lists.wikimedia.org/pipermail/wikimediaannounce-l/2014-November/0010... ), Engineering and Product staff will now be reporting on a quarterly basis.
To get more frequent updates, you can follow ongoing work by watching the master roadmap in Phabricator, where all major work is organized:
https://phabricator.wikimedia.org/tag/roadmap/
(To watch or subscribe, see https://phabricator.wikimedia.org/project/profile/1109/ )
The roadmap links to specific tasks and projects that you can also subscribe to in Phabricator if you don't want to watch the whole roadmap. Anyone should feel free to request an update about a task by adding a comment there.
Remember that you are also encouraged to subscribe to the weekly technical newsletter, to get a high-level summary of technical changes that may impact your experience:
https://meta.wikimedia.org/wiki/Tech/News
I hope that this new process will allow you to follow engineering and product work more closely and in more timely manner. Let me know if you have any questions.