A few weeks ago Sony announced the new NW-A850 walkman that uses a 2.8" 240x400 OLED. They have released a new ad - with an emphasis on the OLED (that's the only feature that's actually mentioned...):

The Walkman NW-A850 series is an update to the NW-A840 series, with 16GB, 32GB and 64GB versions.

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Cambridge Isotope Laboratories - Deutreated Reagents and High-Purity Gases for OLEDsCambridge Isotope Laboratories - Deutreated Reagents and High-Purity Gases for OLEDs