World of Warcraft Patch 5.0.4, also known as the Mists of Pandaria systems patch, is going to be released this week. Updates on Wowtrack will be disabled while the patch is being rolled out in the US followed by the EU and as the community API is being updated.
Update: The patch is now fully live, and updates on Wowtrack are enabled again.
Update 2: Initial testing has shown that reliable raid progress tracking is not currently possible with the data available from the Community API, and updates are disabled for the time being.
Update 3: Updates are now enabled again for both characters and guilds. Guild encounter progress is based on loot as character encounter progress remains disabled until some additions are made to the Community API.