(http://regmedia.co.uk/2008/09/01/sony_s_series_walkman.jpg)
The Walkman NWZ-S544 and the Walkman NWZ-S545 have been leaked by materiel.net, a French online retail site. Both models have very similar features, with the main difference being storage details: 8GB and 16GB. They are priced at 129 and 149 Euros.
Some features include: 8GB and 16GB of internal memory, 2.4″ display, FM radio, Built-in speakers, Plays Mpeg-4 AVC videos, Mp3, WMA and AAC (non-DRM), Battery: 42hrs audio, 6hrs video, 99.3×49.3×10.2mm, an weighs 70g.
Sony S-Series Walkman Review (http://www.youtube.com/watch?v=vCHvWljmvN4#lq-hq)