This update fixes an issue that could prevent L2TP VPN connections from working with OS X Server, as described in http://support.apple.com/kb/TS5313The issue has been a major problem for a number of users, as reflected by over two-thirds of reviewers giving the 3.0.1 version of OS X Server a one-star rating in the Mac App Store. [Direct Link]
This update requires OS X Mavericks 10.9.1 and Server 3.0.1.
Note: the update will only install if you have already launched Server app and used it to set up services.
iOS 9.3 is coming in the Spring and will introduce Night Shift as well as a number of other new features.