Dual core Xuantie 910 out of order RISC-V SBC available for preorder
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The price of course is still well above Pi levels. Existing and working is by far the biggest and most important step, mass production and lower prices comes afterwards.
I don't know whether this SoC has taken the RISC-V Vector extension option for the C910, or what version it would be if so -- most likely draft 0.7.1 like the Allwinner D1 (with C906 core) I'd imagine.
https://github.com/T-head-Semi/aosp-riscv
So it should have a 3rd RV64GC + Vector draft 0.7.1 core capable of 2 128 bit vector ALU operations, 1 vector load, 1 vector store per cycle.