as a developer I have a strong feeling this is more due to Relic prioritizing what they want people working on, and the change log is low on the list. Especially if they follow a similar development framework that is popular amongst software developers today; i.e. code now document later, so they probably don't even have the proper documentation completed by the time these updates are due to launch.
You kinda strange dev. As a system analitic at full time job I always recive ALL changes done by programmers. But this changes almost never done without my permission. The chain like - i give to coder all the changes - he work to put them in - then i got all changes and start to testing it - and the last step, all info about changes are combined and sended to clients.
MVGame