This week saw the release of CareKit, the partner to ResearchKit. While ResearchKit helps researchers gather data and manage content, CareKit is designed more to help patients with active management of their conditions. It's available on GitHub right now and again, is already getting contributions. What a fantastic initiative by Apple.
After Xamarin's acquisition it was announced that it would be released as open source, and here it is! I know most people reading this are using Objective-C or Swift, but this is interesting news nonetheless.
If you're still shipping a WatchKit 1 app you'll need to convert it to be native before June 1st. The conversion shouldn't be a huge job but you'll want to get started on this sooner rather than later.
UPDATE: Apologies, this only affects NEW apps, not existing apps. Panic over! 😌