why it's better than usual App Store?
That will be the central question. I think many people will need good reasons to change the app store.
They have some nice qualities like investing in apps, easy ICOs, decentralization, lower fees, but there will be indeed hard to attract a huge base of users to new app store.
They want to attract developers already with an app on playstore to make a tokenized version of them on playmarket, also crypto apps. And they will have a centralized exchange iirc
The question is, will they be able to get a big enough userbase beside the ones who are using crypto? To develop an app needs money, so if developers now will make a second version of their app for an crypto-based PlayMarket, if they will get enough money in so that will be profitable? Beside that they need to attract non crypto users to come into crypto and use this store. I think this will be very difficult.