When is cn/wow implementation expected to be done?

I can't tell exactly, but new version will be released in max 10 days, all new algos added.

that article was written by fireice so it shouldn't be taken seriously Cool

I never trust one source but on paper fp math is slower on FPGAs unless they have lots of DSP slices.
Now that's the question how many is available and for how much. Efficiency wise they would be order of magnitude better than GPUs.

I got a source that mentions on the FPGAs capable of doing 10 TFLOPs but looks pretty expensive. 10 TFLOPs is what an RTX 2080 does.
https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/pt/stratix-10-product-table.pdf

https://www.digikey.com/product-detail/en/intel/DK-SOC-1SSX-L-A/DK-SOC-1SSX-L-A-ND/9863681
and a 280K cell FPGA is priced at $7.5k