Players who pre-order Thief receive an exclusive in-game mission known as “The Bank Heist”, the press release is below:

As the Master Thief, infiltrate the City’s most secure location, Stonemarket
First Bank, to steal a coveted family heirloom called the Star of Auldale. To
this day, this heavily guarded and treacherous place remains impregnable, but
that’s about to change…A challenging mission that will put your thieving skills
to the test.Outsmart security measures found exclusively in this missionSearch
for the Bank’s unique loot and many other secretsA true homage to the Bank
mission in Thief II: The Metal Age. THE BANK HEIST  will be available for THIEF
pre-orders made ahead of the February 25, 2014 launch