How thick-headed are you? Seriously.
An
early release would be if Blizzard announced that WoD would be released
on December 20, 2014 but then ends up releasing it earlier than that. They have done none of that, though.
Blizzard has said that Warlords of Draenor is targeted for a release in the fall of 2014.
The
fall of 2014 begins September 23. And so since we know that Warlords of Draenor is to be released in the fall of 2014 and
on or before December 20, 2014 we know that it will be released between September 23, 2014 and December 20, 2014.
This means that on or before September
22, 2014 would be an
early release and on or after December
21, 2014 would be a
late release. Anything else would be a release
according to plan. How hard is this to grasp for you? There is literally 3 words involved; on, or and before. Which of these words is it that is puzzling you? Do you know the meaning of "or" and "before"?