I notice one big thing about image-based announcements: I'd rarely hear about the publicly first, and I'd definitely not hear about them internally in an official way. Leak-proofing things.
I suspect the reason for images is because it's simply harder for PR/management types to make a decent looking webpage that works in multiple browsers. It's way faster to export an image from whatever software they use to generate it.
And I suspect it avoids deployment headaches.
It's akin to infographic SEO (You can look it up).
But since I bought an MP3 album a while back, I effectively have a free cloud to store my 40GB of music in. I'll take text-ful-images for that.
Also, can never have too many backup copies of my music.
That's going to be my primary use of this service. I already have ways of accessing my music on my home machine remotely. But an additional offsite cloud backup of 150GB for $20 a year? Sold.
I currently serve my media off of SubSonic but the interface is tired, the API is restricted and pay-walled, and the Android app sucks. Amazon solves all of this.
I definitely will be using it. Plus I can buy cheap-o Class 6 SDcards.