Yesterday morning, many Chinese users found a lot of apps in App Store sold at 1 yuan, much lower than the original prices.
At first, people thought it was a bug of App Store, but it has lasted till now, and aroused a lot of discussions.
One day before, Apple has just announced cooperation with Unipay, a payment means backed by all major banks in China, making it much more convenient for Chinese users to pay in App Store.
So it seems that Apple is launching this promotion to boost Unipay account binding to App Store, and meanwhile, let many of the Chinese users take the first step of paying for apps.