Apple has seeded the fourth build of OS X Lion 10.7.4 to developers. Build 11E52 lists no known issues and asks developers to focus on graphics, iCal, Mail, Printing, and Time Machine. The fourth build of 10.7.4 weighs in at 1.43 GB for the combo update and 716 MB for the delta update.
OS X Lion 10.7.4 Build 11E52 comes just ten days after the previous build of 10.7.4, down one month from the previous iterations. A shortening timeframe between builds generally suggests the update is getting closer to public release.