The information should be up now. This version was an emergency release to address a rewrite rule issue introduced in a recent cPanel release (since rolled back on their end). We released as v5.3.3 to get clients auto-updated to this version ASAP. Since we put out this release outside of normal business hours, release log info was only posted this morning.
Edit: You can also check out our edge group linked in my signature to get the most recent release info (builds + new versions) where we posted about the version soon after pushing it out.