5 questions surrounding Apple's new streaming music platform

"iRadio" is reported to launch next week. What we know (and don't), and what we should be asking.

1. Apple upended the music industry once, can it do it again?
2. Will it exist apart from iTunes?
3. If iRadio is its own app, how will it be integrated with iTunes?
4. It's likely free, but will there be a paid version?
5. The free version is advertising sponsored, but how lucrative will this be for Apple?