seems arktika has the medium term rolled out for it https://www.anandtech.com/print/15710/rebranded-ethernet-technology-consortium-unveils-800-gigabit-ethernet Rebranded Ethernet Technology Consortium Unveils 800 Gigabit Ethernet

You can do quite a lot with 10g already. 1 gbps network supports 1mh/s mining (roughly).

I wonder what the cabling and connectors will be

I remember when 10mb switched was fancy