David Heinemeier Hansson on where the balance lies between native and web content now that we have access to almost desktop class power in our pockets and performance should be less of an issue. It's a good article but it's worth bearing in mind that David isn't saying this is the way to go for every app, this is what works for Basecamp and makes a good experience for that service.
David Smith is going to be blogging his progress with getting to grips with WatchKit. He's started with two posts on Visualizing Watch Apps and Learning in the Dev Forums but I'd expect many more posts as he progresses so keep an eye on the index post linked above.
Even if, like me, you're not lucky enough to have access to Pay yet because you're outside the US and you're selling physical goods in your app, then there's no excuse for not getting started with the technology. Erik Kerber has all the details.