Very likely BBs can't exist in our current high-stability regime, and only in the post-matter universe where vacuum-decay-style events occur more often would they manifest. I think they're incredibly far future only. As for the type of intelligence, it seems probably that they'd be completely alien to us, yes, as there must be modes of intelligence other than that evolved my social monkeys. Don't expect any of them to be friendly (though, what sort of violence they could hope to commit is beyond me).