Apple has already released a Mail 7 fix and has been internally testing Safari and OS X Mavericks updates. Those efforts took a step forward with the release of OS X 10.9.1 and Safari 7.0.1 developers.
While early adopters helped OS X 10.9 easily top first week OS X 10.8 installs, Mavericks adoption has stalled and it’s speculated that’s due to a number of outstanding bugs, including SMB2, Safari 7, iBooks and Remote Desktop.
No public Mavericks update release yet, but a limited package of fixes are in the pipeline.
• OS X 10.9.1 13B27
— Graphics Drivers
• Safari 7.0.1, Safari 6.1.5
— General website compatibility
— Viewing and annotating PDFs
— Login autofill
— Password autofill
— Setting and using break points in Web Inspector
Both betas are available to registered devs on Apple’s Developer Website.
Although Apple could be testing more issues/fixes than those listed above, the OS X 10.9.1 beta seeded would seem to fall short vis-a-vis the known list of problems affecting Mavericks. Happily enough, Apple is also rumored to be internally testing OS X 10.9.2, which will bring a couple minor features and clean up remaining bugs.