Niantic, the developer of "Pokémon Go," is said to be raising a new round of $200 million, bringing its valuation to $3.9 billion. It's a reflection of the continued success of "Pokémon Go" and the sky-high expectations for its forthcoming "Harry Potter: Wizards Unite." Niantic is slowly realigning itself as a maker of tools for other developers — a model that's served "Fortnite" maker Epic Games to great effect. Samsung, which is participating in the funding round, has already said it's collaborating with Niantic in this push.