There are also rumors that Google may be looking at using Swift as an alternative interface to android, that sounds a bit nutty, given that they have golang. But....
1) go is not a suitable candidate for android, as most of the api's are object orientated and involve subclassing sdk classes, which would be awkward and painfull on golang, but not so hard on swift.
2) they would pick up a bunch of companies and devs that are currently building high quality apps for iOS, if swift does succeed in abstracting the foundation classes and provide a reasonable abstraction of the UI classes, it would open up the potential of a universal "app" language, for Mac, Linux, android and iOS.
This may be wishful thinking, but it's worth pushing a few Braincells in that direction.