The fans have demanded it, and Gearbox has listened as they'll be producing more Loot Chests. There will be 5,000 Diamond Plate Loot Chest made in a limited run that will be available this May. While only 5,000 are being produced, Gearbox will consider making more if they run out super quick.
The chest will contain a Goliath Replica Mask that you can wear (plus one for your in-game character), shift codes, window decals, item cards, authenticity card, Wanted Posters and will run for $99.99.
Gearbox has partnered up with Think Geek to make this happen in the US, and international folks will be able to ge the Loot Chests through Forbidden Planet. Plus Gearbox's official store will have these for sale as well.