To access user accounts, please use the requestAccessToAccountsWithType:options:completion: method.

ENGADGET: Apple seeds iOS 6 beta 4 to developers: here's the changelog

But, according to a Commons public accounts committee report published in May, this is still several years from completion and had been set back by failures to reach agreement on specifications with allied forces.

BBC: NEWS | UK | No easy fix for 'friendly fire'