Apple has just released an update for the developer seed of OS X 10.9.1. The new version has a build number of 13B35 and includes fixes for the Mail app, VoiceOver, Safari, and VPN server support. The presence of the release notes indicate that the update is nearing completion and will be available to the public soon.
This update comes just a few weeks after updates to the Mail and iBooks software were released to resolve issues with those apps. Despite the Mail app having been updated to resolve Gmail-related issues, many users are still experiencing problems. The 10.9.1 appears to contain fixes for the remaining bugs.
Apple has also issued a new beta version of Safari 6.1.1 for Lion and Mountain Lion users. This version of Safari is curiously absent from the Mavericks beta that was seeded today.
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The update is available in Software Update for developers on previous 10.9.1 seeeds. The Safari update can be downloaded from the Developer Center.