You know what's needed?

The release of a "Limited Order" Edition or something like that. Which comes with a replica mask and concept art, along with the "Arcane Assassin Pack" as promised. It could be sold, easily, for $99.99-$120.

This would be a great for gamers who like throwing the extra money out there to get items that not every person who bought the game on release got.

Think about it.

There's already an active thread about this topic, you're welcome to chime in http://www.gamesas.com/topic/1367101-special-edition/