The Sony NW-ZX2 is the latest and by the far the most expensive Walkman from Sony. The player features a 4-inch display, and is based on Android 4.2 JellyBean. The price is set at $1200.
http://www.notebookcheck.net/Sony-s-new-Android-based-Walkman-to-be-priced-at-1-200.134138.0.html