Even Firmware 1.64 on the LinkStation WVL does not have the ability to manage playlists.
I do see 'Recently Added', 'Newly Added' playlist on my Sony DLNA TV. It would be nice through the web interface to either create a playlist or upload a correctly format playlist file (.m3u, .pls) to where the built-in ones are placed, so DLNA clients can see them and play the music.
Thanks