Clearly Betamax. It certainly has it's uses and it's development is led by the right people but there's no magic.

It's just another LLVM frontend.

Also I'm slightly annoyed by the fact that they kept talking about great GPU performance in their marketing material and all you can find in the docs is: "it's coming. probably. only to Nvidia hardware btw."

I think it's unlikely. As I understand it, it's essentially a nicer version of Cython, and that is still extremely niche.

The problem is you're advertising performance and static typing to Python programmers, but pretty much anyone who is voluntarily choosing to use Python has already decided they don't care a jot about performance or static typing.

Everyone else who is forced to use Python doesn't have the option of introducing another language anyway.