AllWinner are one company that has publicly disclosed doing a large multi-million run of chips: http://www.semimedia.cc/?p=7803 It's not exactly clear from that announcement what they are going to use them for though. "industrial control, smart home, and consumer electronics" - that's everything :-)
This is great news. If peripherals are the same or similar to those in their existing ARM SoC chips, we'd be close to full support on release thanks to the linux-sunxi project efforts[0] and similar efforts in netbsd.
There are probably lots more, but lots are not documented.
They are in a lot of current Western Digital SSDs. Nvidia is known to have them in their GPUs in some form. I know of other consumer products where they are similarly used as embedded CPU, which is where RISC-V will be most prevalent in the coming years.
Western Digital is heavily involved in RISC-V, but I wasn't aware that they had confirmed any of their products are using RISC-V yet. Last I heard from them, their first generation of in-house NVMe SSD controllers were definitively not using RISC-V. And their second generation of NVMe SSD controllers is only just starting to ship.