Mac OS X Panther: Approaching First Candidate
Apple seeded Panther and XCode 7B53 versions today -- which includes the usual round of bug fixes and remaining 'known issues'.
Of interest, Apple writes: "We are fast approaching first candidate build" in the included Seed Notes provided to developers. (as noted by ThinkSecret today)
As Apple ramps up towards as final release (aka Gold Master) of an Operating System, they typically go through a variable number of "Final Candidate" releases for final testing/bug fixes.