I agree, it's still early and there's not much info at the moment. Still, in the maxwell repo, there's mentions of "GPS acquirers" and in the SysUI repo, there's icons for battery, airplane mode, screen rotation and cellular signal.

Nothing really specific for phones since these things can be found in some tablets and laptops, but apps in Fuchsia are made with Flutter, so it's interesting since it was made to make cross-platform mobile dev easier on Android/iOS.