Now that Swift is open source, we have a lot of visibility inside the project. That includes new features and discussions that can help us be prepared for new features or important changes on the language itself.
If you go over to https://github.com/apple/swift-evolution/tree/master/proposals you can get a pretty good idea where the language is headed to, and, as Daniel Jalkut mentioned, potentially help you overcome bad habits and save you a ton of time writing code that you’ll have to change later.
I’d keep an eye on that page and read each proposal thoroughly. These people are very smart and they know what they’re talking about — I’m sure I can learn a lot from them and their reasoning behind their proposals.
My favourite so far: Removing currying func declaration syntax