As already seen, lots of the changelog stuff is not what it may sound like.
Specifically a lot of Russian content, map stuff, and a lot of stuff is uncoded, or reserved for maps far into the future. Basically the SVN is used as a storage - there's no guarantee all content there will ever get used. But we hope to!
As mentioned, its not really intended for public release, as only the title of the changelog entry is included in the changelog. In our revision system which auto-posts to the betatester forum, details on said change are explained within the thread. A seemingly unimportant entry may change 100 files, and so on. In addition, only specified SVN revisions are posted to the changelog/tester forum.
But we still enjoy releasing them, and will happily clarify any questions directed at specific entries, but we reserve the right to I KNOW NOTHING! Just don't make any assumptions based on it.