The usage of Kids Corner was too low to justify continued development and support of the feature. (blogs.windows.com)
We've got more improvements coming in future app updates that will be delivered through the Store Beta including a Live Tile showing what's currently playing, pinning favorites to your Start screen, exploring the full catalog and listening to Radio with an Xbox Music Pass, support for Kids Corner, the ability to shop for music in the Store Beta, and more. (blogs.windows.com)
In it, we get to see some remarkable shots of the never before seen Kids Corner in action, as well as the much anticipated SmartGlass in its leaked debut. (wp7connect.com)