iOS 9.3 is coming in the Spring and will introduce Night Shift as well as a number of other new features.
Apple Releases Safari 5.1.2 with 'White Flash' and PDF Viewing Fixes
This update contains various improvements, including fixes that:Apple seeded a version of Safari 5.1.2 to developers for testing earlier this month.
- Improve stability
- Address issues that could cause hangs and excessive memory usage
- Address issues that could cause webpages to flash white
- Allow PDFs to be displayed within web content