Are any new ethnicities forming iyc?
I think Hawaiian Hapas are getting close to an ethnogenesis. There's already second-generation Hapas.
Asian-American is slowly developing its own distinct subculture of partly White/Pan-Asian mutts. Like a west coast parallel to what happened with Black Americans in the southeast.
They're developing a new language too that mixes every Oriental language together with English and Hawaiian, like an Azn version of AAVE/Gullah.