FPI also seems sensible in that frozencpu product pic with ruler. I wonder how noise/performance wise very limited 180mm fan selection in market does. Otherwise more frontal area always good. And yes, seems tailor made for FT02/RV02 cases (both 3x180 fan config wise and lowered thickness, due limited space between GPUs and fans in those cases).
If there will be good 180mm fans out there, i imagine 3x180mm rad size to be very popular in future. Shorter then 560 rads so should fit in more full towers, and less unused space by sides. It looks though that most vendors jump from 120/140 fans to 200+ ones instead of 180 fans, so probably it will work only for silverstone if no-modding is considered.