This was a completely unexpected inclusion in yesterday's announcements. It's at the core of all of the work for this Swift release and even gets used in the Getting Started document.
It's very early days for this tool and it's definitely not (yet) a replacement for CocoaPods or Carthage, but I see the start of great plans here. Once it grows and potentially gets integrated into Xcode I can see that this could easily become the primary package management solution for all Swift development.
The final huge piece of news that accompanied yesterday's release was that there is a Swift implementation of Foundation in progress and they are aiming for parity with Obj-C Foundation for the release of Swift 3. The goals of this are mainly focused around portability and cleaning up some of the baggage of Foundation such as new naming conventions, the removal of NS prefixes, that kind of thing.
I am very curious about Apple's plans for portability. There's always a reason for changes and I wonder what announcements we might see at WWDC 2016 on the subject of server side Swift? Maybe CloudKit + Swift on the server? Maybe something even more adventurous?