Fuchsia OS

Why is Google building a new RTOS called Fuchsia?  Unlike Chrome OS and Android, which are based on the Linux kernel, this OS is based on a new microkernel called Zircon.  Some recent news articles are suggesting that Google is working on adding Swift programming language support to the Fuschsia OS.  Given Swift’s rapid growth and popularity among developers, it would certainly be great to have a single programming language to write applications for Google and Apple devices.