iTunes and streaming: together at last?

In the iTunes store right now, there is an option to stream an unreleased Justin Timberlake album for free.

It's basically an hour-long track without the option to listen to individual songs, and it's limited to this album. Considering Timberlake previewed this album on Myspace a while ago, I don't think he's emblematic of the major labels.

However, the streaming works quite reliably, and the quality is on par with any other iTunes preview. I think Apple's streaming solution is coming sooner than later.

My biggest question is how the interface would change to accommodate this...anyways, what do you guys think?