updated 03:51 pm EDT, Wed May 7, 2014
Public release could hit as soon as this week
Apple is seeding another new build of OS X 10.9.3 to AppleCare workers, listed as build 13D62. The previous internal build was 13D59; developers, by contrast, are still on 13D55, at least three builds behind the latest release. Change notes included with 13D62 haven't changed since the ones bundled with 13D57.
The fact that OS X 10.9.3's progress is now strictly internal may suggest that Apple is finally close to a public release. That could happen as soon as this week, or even later today, depending on whether Apple feels it has quashed all significant bugs.