Supposedly, a gaming magazine was brought to Blizzard's offices in the fall of 2005 to view the The Burning Crusade expansion pack for the first time. There were dozens of posters and artwork depicting the pandaren as the new Alliance race. A so-called pandaren screenshot was also leaked, but was eventually dismissed as fake after the draenei were announced. Other gaming sources stated that when "mentioning the ex-April-Fool's-joke Pandaren Empire to Blizzard staff got a surprisingly cagey response..."
Blizzard would not confirm or deny these rumors directly until BlizzCon 2011, when Chris Metzen confirmed during an interview with Direct TV that the pandaren were indeed the original Alliance race for The Burning Crusade, but about halfway through the development of BC they were replaced with the draenei. In light of this revelation, the pandaren screenshot might have a been legit leak.