After today’s update to Apple Store iOS App, I just realised the app is now available for all Singapore App Store users! Previously, I tried to download it and it just say it is not available in my region yet.
With WWDC 2015 taking place from 8th June 2015 till 12th June 2015, Tim Cook will probably announce the second wave of countries for the Apple Watch and I am pretty sure Singapore will be in. On a side note, Infocomm Development Authority of Singapore (IDA) has listed Apple Watch in its database.
Perhaps, with the launch of Apple Watch in Singapore, there will be an official Apple Store in Singapore finally? And maybe that explains the official Apple Store iOS app being made available in Singapore? Or another reason I can think of is Apple want to let you find Apple Premium Resellers in Singapore easier?