An anonymous tip to MacRumors says that 10.3.7 is ready for release this week. Expectations for it include improved AFP support for saving documents with long file names, improved OpenGL technology and updated ATI and NVIDIA graphics drivers, improved FireWire device compatibility, updated Preview application, improved compatibility for third party applications, and previous standalone security updates.
OS X 10.3.7 was previously rumored to have begun testing in November, directly following the release of the 10.3.6 update.