Drew Karpyshyn not only resembles Commander Shepard facially - he created him. Drew Karpyshyn was one of BioWare's greatest ever writers. He was lead writer of cherished Star Wars role-playing game Knights of the Old Republic, and he was lead writer of Mass Effect 1, 2, and all the books in-between (not Deception). Along the way, Karpyshyn also influenced Baldur's Gate 2: Throne of Bhaal, Neverwinter Nights, Jade Empire and massive storied MMO Star Wars: The Old Republic - a job that meant he couldn't be a part of Mass Effect 3.
UPDATE: The source code behind the teaser website includes cryptic references to the Baldur's Gate series and lore:
Drew Karpyshyn, the lead writer of Star Wars: Knights of the Old Republic and Mass Effect 1, has retired from BioWare and video games.
A 1000 developers have voted Baldur's Gate as their favourite all-time game, the World Gaming Executives network has announced.