Google currently does not disclose how much Fuchsia official news, but because it is developed as an open source project, from the open code can find a lot of relevant clues.
TaligentThe project is designed to look similar to the classic Mac OS, using the new microkernel, but still able to run the same application. Google apparently want to achieve similar goals with apple on Fuchsia, the new operating system needs to maintain backward compatibility with Android applications. Fuchsia may support Android at the time of release, support existing applications, and then gradually phased out Android.
One of the problems with the Linux kernel used by Android is that it lacks a stable driver ABI, so every version of the Android needs to be rewritten and updated, and few vendors are willing to do so. In the Android ecosystem, there are a large number of devices lack of updates or no updates, which is increasingly becoming a serious security problem, a security nightmare. Fuchsia may be an attempt to solve the problem.