So, the 27th of january Lordaeron was updated with a big patch, and the announcement on the fronpage said the changelog would be posted a couple of days later.
Now its 10 days ago, and in that time, Lordaeron had another update as well (afaik?) - but still no changelog post?
The weirdest part is that the announcement was later edited and now doesnt mention anything about an upcoming changelog update.
As far as I know, they do not post a Changelog until it's been 100% proven all of the bugs are fixed. Maybe they found a bug or two that needs a re-fix, or they saw some other things that could be fixed and included in it, or they didn't have time to go over the whole Changelog to make sure everything is working as it should before going public with it.