Apple has updated the Featured Stations in iTunes Radio, likely in preparation for a demo of the service during today’s iPhone launch.

The featured stations include Spin the Globe, Trending on Twitter, iTunes Top 100: Pop and the Pepsi-sponsored Pulse #Now.

iTunes Radio will be available on all iOS devices, including Apple TV, as well as in iTunes on both Macs and PCs, as a free ad-supported service. There will be one audio ad every 15 minutes, and one video ad per hour. However, iTunes Match subscribers will be able to listen to the service free from ads.

Thanks, Nick!