Engadget mentions an interesting MP3 player. The HomePod plays MP3 from Mac, Windows or Linux Computers via 802.11. There are internal speakers, but it also has RCA, and coaxial and optical digital output for connection to your AV Receiver.
I like the fact that there is an LCD where the track names can be displayed. I hope that the protocol that it uses, so other people can write their own servers, if the supplied one is not good enough. I do think that the current $249 is a reasonable price for this.