My usual comment on the subject ...
Send one to me and I'll write a cgminer USB driver for it ...
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PM me here or visit IRC FreeNode #cgminer to talk ...
Thanks Kano, I'll run it up the ladder
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... and I will add that there are clear design considerations to take with USB ... to optimise software performance with the device ...
Different of these issues become more critical depending on the device performance.
This being FPGA, you would need to take critical notice of the similar BTC FPGA considerations ... that no FPGA device does optimally ... but some certainly do better than others.