The Swift programming language is the successor of Objective-C, I think it's not a C-family member but a C++-family member.
It has been developed to update the old-fashioned Obj-C and to result more easy and clear in use than it.
I didn't try it yet but voices on its performances are constrasting: someone says that it's faster than Obj-C, someone else says it's slower...
The only thing that it's clear is that it's an Apple-only language, due to the fact that it will run only on MAC/iOS.