This could be bad. It will definitely be interesting. From the Daily Beast:

An Army intel analyst charged with leaking classified materials also downloaded sensitive diplomatic cables. Are America’s foreign policy secrets about to go online? Philip Shenon reports.
The State Department and American embassies around the world are bracing for what officials fear could be the massive, unauthorized release of secret diplomatic cables in which U.S. diplomats harshly evaluate foreign leaders and reveal the inner-workings of American foreign policy.
Diplomatic and law-enforcement officials tell the Daily Beast their alarm stems from the arrest of a 22-year-old Army intelligence analyst based in Iraq who has reportedly admitted that he downloaded 260,000 diplomatic cables from government computer networks and was prepared to make them public.