A new single-board computer from Chinese semiconductor designer Allwinner will feature an SoC based on the RISC-V 640bit architecture. However, the board lacks power due to its single-core CPU. Since it supports Linux and should cost less than US$15, the SBC should still be versatile enough for tinkering and projects.
https://www.notebookcheck.net/Allwinner-set-to-release-low-cost-single-board-computer-with-RISC-V-processor-in-May.532139.0.html