The Warcraft universe itself has a myriad possibilities to borrow, from dinosaurs to steampunk, with the hard honor of the orcs to the nonsensical gadgets of the gnomes. The upcoming Cataclysm also brings forth a lot of story possibilities, as does any time of great change. Races are opening their doors to previously shunned concepts such as night elf mages, while others are rediscovering a lost heritage in the Darkspear tribe's druids. The Lich King's grasp on the world has been beaten back and veterans of the war in Northrend will be returning home to try and resume their previous lives as merchants and farmers. Races like the gnomes and dwarves have had their eyes opened to their origins in titan creation, which could rock the very foundation of their ideals and beliefs.
So, I bring the question to you. What's the story you would write? Will you delve into StarCraft and Diablo or stick with WoW?