As well, I'm happy to let the keen early-adopters be the guinea pigs. Xcode 8 only came out today. If you have production apps, it's madness to upgrade on day one. I'll wait a few weeks/months for the remaining bugs to shake out.
Don't get me wrong I'm very pro-Swift. But I'm also mindful of my time and sanity. Switching to a new language sure sounds fun, but not exactly productive (in the short term). When I do switch, I want everything to be rock solid, stable, all the tools, docs and everything.
But I have created a couple of toy projects in Swift, and I'm very excited to start using it properly in a year or two.