Apple now allows to pick specific regions to support pre-orders for apps and games. Release dates now could be set separately as well.
Offering your app or game for pre-order is a great way to build awareness and excitement for your upcoming releases on the App Store. And now you can offer pre-orders on a regional basis. People can pre-order your app in a set of regions that you choose, even while it’s available for download in other regions at the same time. With this new flexibility, you can expand your app to new regions by offering it for pre-order and set different release dates for each region.
Apple Developer
Apple Developer: Pre-orders by region now available