If you do the quests to see the hidden content you are able to view links to three new wallpapers. I will post two of the three, because the third one sucked. Also, you can download a new song, which isn't very long, but if you're into the WoW music you'll like it.
Blood Elf Female Paladin:
http://media.worldofwarcraft.com/bc-...s_1280_960.jpg
Dreani Male Paladin:
http://media.worldofwarcraft.com/bc-...i_1280_960.jpg
Song (3.0 MB):
http://media.worldofwarcraft.com/bc-...oon%20City.mp3
~Leoj:yuck: