The new Sony Walkman E series is expected to be hit the store in the next few months.

They will be available in three version: 2GB (NWZ-E435), 4GB (E436), and 8GB (E438) that going head to head with iPod nano. Featuring 2-inch QVGA TFT LCD display, this mini PMP can play music up to 14 hours without recharging.Source