The AC-75 foiling monohull is radical even by America’s Cup standards. A 75-foot monohull with no keel, and 2 canting T “dagger boards.” These should be even faster than the 50-ft foiling catamarans.
The 36th America’s Cup will run in March of 2021. The first regattas start in September of 2019. So far there are the Kiwis (the defender) and 3 official challengers. (They are hoping for one or two more challengers.)
One team has built a 24t test platform, but there is limited video, since the teams focus on secrecy and security a lot. And also they seem to crash quite a bit. So the best video to date is the computer graphics explanation of the class. (Video from The World Sailing Show.)