If an existing language already has potential to replace PHP then I don't see why it wouldn't have already. What would/could you tweak that would get you there without fundamentally changing the language capabilities and syntax?
Currently, no other language can match that. They either require a VM running (Java, Ruby, etc.) or at least have a compile/build step (Python).
UWSGI has a lot of promise, but until it's as easy to get configured as PHP-FPM, PHP is still way easier than everything else.
I suspect that he is being deliberately vague here; in other words there is an announcement coming at some later date and this is preliminary PR. That doesn't make it untrue though.