This will not happen. I saw a quote from Matz that he believes that type signature will be obsolete in 10 years and he doesn't want to add them (I will need time to find it). Important: he didn't say that he against static types (he is for it), he didn't say he against static analysis (he is for it).
The second point, nobody wants to repeat the Python2 vs Python3 situation, so it will be a gradual type system (I guess).
I'm doing a series of blog posts on Flow and TypeScript. There are, for sure, differences, but not so dramatic. The biggest issue with Flow is closed development, awful tooling and not very big community, but not the power of the type system itself. It is fairly comparable to TypeScript.
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