Call me a lore noob (and that's fine, Alex will heartily agree with you), but like Loregy.com suspected, I had never before heard of Jarod Shadowsong. We pretty much all know about his sister Maeiv, thanks to her little tirade against Illidan and the big part that played in the last expansion. But Jarod might be Azeroth's biggest unsung hero. And considering that all of the rumors point to the next expansion diving into the Maelstrom and/or the Emerald Dream, not to mention an eventual showdown with Sargeras, he could also play a very important part in Azeroth's future.
Jarod led the charge in the War of the Ancients, a huge battle thousands of years ago in Azeroth's past that culminated in Jarod's taking full command of the Kaldorei Resistance, a one-on-one battle with Archimonde (players have faced him, too), and eventually the collapse of the Well of Eternity. An event that led directly to, you guessed it, the creation of the Maelstrom. See how it's all coming together?
Loregy has more speculation: just like during Jarod's time, the Horde and Alliance are growing apart, and if Sargeras decides to bite back after what happened in the Burning Crusade, we'll need a leader to combine the troops. Thrall and Wrynn are each powerful leaders in their own right, but Jarod is the big daddy of generals. And if big trouble goes down in the next expansion, he could be the key to saving the world again. And the guy doesn't even have a picture on WoWWiki!