After several weeks of beta testing, Apple has released iOS 10.2.1 to the public today. The update is fairly minor and includes no major improvements to core iOS apps or features. The release notes say only that it fixes bugs and includes security improvements. The security page for the update lists a number of vulnerabilities in the kernel, WebKit, and the Contacts app that have all been fixed. Apple also addressed a bug that could allow attackers to briefly access the home screen on an Activation Locked iPad that had been reset.
The update is available for everything that runs iOS 10: the iPhone 5 and newer, the fourth-generation iPad and newer, the iPad Mini 2 and newer, both iPad Pros, and the sixth-generation iPod Touch. Small updates for watchOS 3 and tvOS 10, both of which are iOS-based, have been released as well.
The release of iOS 10.2.1 clears the deck for betas of iOS 10.3, which is likely to be the final major revision to iOS 10 before work begins in earnest on iOS 11. We don't know much about what Apple plans to include in this next update, but older rumors suggest that it may renew focus on the iPad in advance of some new tablet launches in the spring. Hope also springs eternal about a dark mode for iOS.