Sony is introducing Mocopi, its wireless, phone-based motion capture system for controlling virtual avatars, to the US following the product’s Japanese debut earlier this year. Mocopi is available to preorder now for $449 exclusively via the Sony web store and is expected to ship to customers starting July 14th. Japan has long been a popular market for virtual streamers (also known as “Vtubers”), content creators who portray fictional, animated characters — usually through motion…