When it comes to portable media, Sony strayed away from actual Walkman players, rather they added a hefty arsenal of Bluetooth accessories including a Bluetooth Transmitter/Receiver, Walkman Adapter and pair of Bluetooth speakers.
The HWS-BTA2W (pictured above) is a small Bluetooth 2.0 transmitter and receiver. Basically meaning that it will either connect to pair of speakers and transmit to a Bluetooth enabled player, or it can connect to the MP3 player and transmit to a pair of Bluetooth enabled stereo speakers. The two other accessories below complement this receiver that will be coming out later this year.
The SRS-BTM30 is a small Bluetooth-enabled speaker system that has a total power output of 6W. It also includes an auxiliary input that can have other players plug directly in to. This Bluetooth speaker system could easily connect to the Bluetooth transmitter and receiver mentioned above plugged into an MP3 player.
The WL-NWB1 is a Walkman Bluetooth Adaptor about the size of a quarter and plugs into the base of the NW-S703 Sony Walkman. That is the only current model that will support this soon to be proprietary Sony adapter, but all future Walkmans will include this port.