Sony Japan introduce a update to the A-Series Walkman series. The new NW-840 walkman series comes with an 2.8 inch Am-OLED Display. The resolution of the AMOLED is WQVGA (240×400 Pixel)Thanks to the OLED Screen the A-Series is the thinnest walkman which only 7.2 mm thick.
Also new is the TV-Out function so you can output a 720x480 pixel quality to some Flat-Tv.
The new walkman series does have a battery life from about 29 hours. There is also some new drag and drop method, with that you can easily transfer music and videos.

The Player supports Video: MPEG-4, AVC (H.264/AVC), WMV
Audio: AAC-LC, WMA

The new A- walkman Series from Sony includes following models:
NW-A847 (black or brown) with 64 Gigabyte memory
NW-A846 (black or brown) with 32 Gigabyte memory
NW-A845 (black or brown) with 16 Gigabyte memory

Source: Sony Japan