The update is build number 14E17e, while the previous build was 14E11f.
The OS X Yosemite 10.10.4 update improves the stability, compatibility, and security of your Mac.
Apple tells developers to focus on photos, migration, and Arabic and Hebrew languages.
Update: Apple has included Safari 8.0.7 in this latest build, an update from the Safari 8.0.5 that was included in the last seed.
Please follow iClarified on Twitter, Facebook, Google+, or RSS for updates.