Apple's App Store in the United States and elsewhere has changed the “Free” button to “Get”, as first noted by Sebastián Salazar on Twitter. The new “Get” button now appears in the App Store on the iPhone, iPad and iPod touch devices, as well as in the App Store section of iTunes for Windows and Mac.
As Salazar noted, the change may be in response to the avalanche of freemium software models that have been dominating mobile application stores for quite some time now.