The Register is reporting that Creative has designed a wireless MP3 player. However, it uses neither WiFi or Bluetooth, but rather LibertyLink from Aura Communications.
LibertyLink would let the Creative device wirelessly beam music to headphones at a distance of up to 2m without significant sound degradation. Also, you would not be able to wirelessly connect the Creative device to a computer, you would still need cables for that. [Via Engadget]