Folks, I first went to WDW in 1971 during the soft opening of the Magic Kingdom. I was a VERY LITTLE kid (but we still have photographs of it, though none scanned) who literally chased down Main Street following Eeyore calling out "Don't Be Sad Eeyore! I love you!". Regardless of what Disney's done to him over the past decade or so, trust me, Eeyore was and is always SUPPOSED to be Grey.
Enjoy the Magic!