I say push as hard as possible to get actual boards out there. It's not going anywhere if nobody can use them. My suggestion is a clone of something like Pi that preferrably is compatible with its addon boards and such. Drop in replacement.
That being said, you can already use a RISC-V processor by programming the RTL onto an FPGA board. The Zedboard and ZC706 are both officially supported. Though both of these boards are pretty expensive.
When (roughly estimated) can we expect the first actual boards?
> The Zedboard and ZC706 are both officially supported. Though both of these boards are pretty expensive.
How long will these boards be supported in later versions of Risc-V / ISA? It makes no sense to purchase an expensive board unless it can be used for a long time in upcoming RTL versions.