GarageBand to be Free with In-App Purchases
Following the updated icons on the built-in apps page for the iPhone 5s, Apple has also added that they will start offering GarageBand for free with the purchase of a new iDevice. Before, iPhoto, iMovie, Pages, Numbers, and Keynote were free, but GarageBand was not. Apple has this in the fine print about GarageBand being free:
GarageBand is free on the App Store for all iOS 7 compatible devices; additional GarageBand instruments and sounds are available with an in-app purchase.
From this we can tell that there will be in-app purchases, but for the most part it will be free. Apple will likely announce this and make the app free on Tuesday when they hold their media event.