As alluded to in iOS 11.3 beta 4 first reported by 9 to 5 Mac, the official iOS 11.3 Update added Apple Pay Transit support for Beijing and Shanghai brand China T-Union IC transit cards joining Huawei, Xiaomi and Samsung which previously added China T-Union card support. Apple lists support on the Apple Pay Transit page as Express Transit “Beta” cards, other Apple support pages have instructions for adding and using them. One interesting difference from Suica is that plastic Beijing and Shanghai transit cards can still be used after being transferred into Apple Pay. Chinese users posted images to Twitter, Wei Feng has details in Chinese, Apple Insider posted an article as well.
Apple appears to be making it easier for Apple Pay to support IC transit cards in iOS 11.3. Suica has become the default transit card in Wallet accessible in all iOS 11.3 Region settings not just Japan anymore. Japanese IT Journalist Junya Suzuki tweeted that according to his sources Apple has been in talks with many transit agencies. The sources suggest that Apple Pay China T-Union card expansion could be coming soon and is “highly possible.”