Not really, we as a community know already that the best way to significantly change a language by keeping full compatibility is to write a preprocessor (CppFront way).

Carbon is DOA as it hacks a compiler, and Circle isn't even in active development (again if it would compile to C++ that would be a better direction).

At the same time putting ideas from Carbon to CppFront is possible (I wish Carbon developers would also think about going the preprocessing direction).