From March 26th the Season Pass will be available to the tune of £15.99 and 1600 Microsoft Points, apparently grant us £24 worth of add-on content. Early Bird Special Pack bonus offer.
Purchasing the Season Pass gets us the additional stuff available in the Early Bird Special Pack, for free, which features "four pieces of exclusive gear" to use in Columbia.
Those who pre-order BioShock Infinite will also get the Industrial Revolution Pack, giving 3 "in-game gear items that boost combat abilities, $500 bonus to in-game currency, five lock picks and the Industrial Revolution puzzle game, which unlocks stories of Columbia and allows players to pledge their allegiance to the Vox Populi or Founders through Facebook."
The Early Bird Special Pack contains "four pieces of exclusive gear, a Machine Gun Damage Upgrade, a Pistol Damage Upgrade, a gold skin for both weapons and five Infusion bottles that allow players to increase their health, their shield durability or their ability to use Vigors by increasing the quantity of Salts they can carry."
BioShock Infinite releases on Xbox 360, PS3 and PC March 26th, alongside the Season Pass.