To answer the question by goldclub, there are two ways to release the app on Google Play:
1. It is an upgrade to the current app. After publishing to Google Play, users will get the update on their phone and it will replace the old Goldcoin Wallet is currently on Google Play.
2. It is a separate app. Users will have to install it on their own from Google Play. If they have the old GoldCoin wallet, both will exist on the phone.