Sorry if this has been answered (I did use the search feature)
current short answer: no, not any current builds that will run on arm64 based rock64. given microsoft interest in arm64 over past year it might be possible for an iot build at some point. the is an win10 iot for the pine64 board that sorta works.
Currently there is no plan on support Win 10 IoT on ROCK64 platform.