User blog comment:ZERO N7/Any plans for more DLC in 2011?/@comment-98.248.191.246-20110328022855/@comment-3455248-20110328030428

Some items, like the Deadly Assassin Outfit, were initially available only if you pre-ordered the game before its release last May. Those items will supposedly be available for purchase soon. It's similar to what Rockstar is doing with L.A. Noire where each retailer has different exclusive pre-order items right now, but all will be available for purchase later on.