Apple is now seeding the latest build of OS X 10.9.1
-- 13B40 -- to AppleCare workers, a report says. The code reached developers Tuesday night, but its distribution to AppleCare is believed
to be more significant, since it implies that the software is close enough to completion that AppleCare workers can start familiarizing themselves. A finished update might therefore reach the public within the next week or two.
Version 10.9.1 deals with several problems, particularly ones in Mail related to Gmail, Smart Mailboxes, and contact groups. Other fixes target VoiceOver's handling of sentences with emoji characters, and tweak Safari so that Shared Links will periodically refresh when it's open in the sidebar.