Here's Business Wire's write-up on it, with a direct link to the Google Play Store location in the third paragraph:
Samsung just announced its new streaming Milk Music service exclusively for Galaxy devices. It's on the Google Play store but the download link is blocked on my Skyrocket with a message that the device isn't compatible. Turns out it's only officially supported on Galaxy S3 and up. Is there any way to trick Play Store into thinking we're using one of these devices so we can download it to our S2 Skyrockets?