Apple has driven out a recent update to iTunes, bringing alongside support for syncing with the newly-announced iPhone SE and 9.7-inch iPad Pro. This is the lone exchange indexed with the iTunes 12.3.3 update:
This update provides support for syncing iTunes with iPhone SE and iPad Pro.
Whilst neither product is to be had for acquire simply but (orders will kick off on March 24), you should see iTunes might be in a position to sync once they get started arriving in consumers' palms. For now, you'll be able to seize iTunes 12.3.3 from the Updates segment of the Mac App Retailer.