This is really awesome news. I'm pretty excited to see what they do in 3.0, I'd love to have another language under my belt without fooling around with NS-nonsense. That they might actually take Linux desktop seriously is really exciting to me also.
I'd love to see a widely-used tool where games and popular apps that would traditionally be put out on Win/Mac are able to be used seamlessly on Linux also. On top of that, I definitely don't want to write Java, I definitely don't want to write ObjC, etc.
Interestingly enough, I think this might even compete with Dart, which I suspect will end up getting Wasm support and ultimately replacing Java for android development... (Just a wild shot in the dark...) So I can't wait to see what the Swift starts brewing up in the Concurrency department.
How exciting!