Nothing's changing right now, but if you want to get a head start, download a Subversion client, skim through the Subversion Book, and play around. We have a test server containing the LJ repository available at http://www.livejournal.com:9080/svn/danga, but that could be taken down or moved elsewhere at any time, so don't rely on its continued presence.
The Zilla item about this is Bug 320.