While we've had hints and suggestions as to how the Aspects and the varying dragonflights came to be, it's never been truly defined. And when we made our trip to Northrend in Wrath of the Lich King, the proto-drakes found roaming the peaks and valleys of the continent were an intriguing puzzle. How did dragonkind make that leap from proto-drake to dragon? Who was Galakrond, and how did his existence tie into the existing dragonflights? Was he the father of all dragonkind in a literal sense, or in a far more figurative fashion?
Perhaps most importantly, at the dawn of the Age of Mortals, does any of this information really matter at all? If you're at all interested in the history of Azeroth, the answer is a resounding yes.