The data comes from App Annie (via AppleInsider), which explains that China's booming App Store's growth has accelerated by around 2.2 times between Q1 and Q2 2015, and is continuing to rocket. Much of China's App Store growth is centered on in-app purchases (IAPs), which are popular among a number of the country's most-popular iOS titles. It seems China really has moved towards a “freemium” model, where games are free to download but riddled with IAPs. This is resulting in huge revenue from the country's App Store.

Indeed, revenue from China's App Store overtook Japan's revenue for Q1 2016, and it's the first time this has happened, ever. This is something of a miletone for China's iOS app economy, which has indeed been continuing to grow since its launch.