updated 03:54 pm EDT, Tue March 18, 2014
iTunes update returns local calendar and contact sync
Apple has begun seeding new pre-release betas of OS X 10.9.3 and iTunes 11.1.6 within the company. Of the two the latter is the most significant, since it's the first v11.1.6 beta and makes a critical change to iTunes, restoring the ability to sync contact and calendar information to iOS devices via a Mac. The alternative for affected people has been using iCloud sync or manual entry.
It remains unknown when the betas will reach developers, or when the updates might be finished and go public. The last developer beta of OS X 10.9.3, though, was only the second.