The off-cycle release of major new features in iOS 9.3 is quite a departure for Apple. The usual cycle until now has been for major releases to debut at WWDC in the summer and ship in September/October. For the education market, however, this schedule has been extremely difficult to deal with. School usually starts in August or September - in the northern hemisphere at least - and having a major platform upgrade happen right after school starts is hard to cope with.
That has all been turned on its head. On January 11th, Apple announced the developer beta release of iOS 9.3. Unusually for a developer beta, Apple also produced the kind of iOS preview webpages that are normally seen in the time between the WWDC announcement of a new major iOS version and its eventual release.