"But if the old agreement between Apple and Google expired in the first half of 2013 (which, again, my own sources familiar with the matter agree to be the case), that means the deal was set to expire halfway through the expected year-long life cycle for iOS 6. If Apple had stuck with Google Maps for another year they would have been forced to renegotiate with Google in a situation where both sides at the table would know that Apple either (a) had to agree to whatever terms Google demanded to extend the deal; or (b) would be forced to swap the mapping back-end of iOS 6 midway through its development cycle."
http://daringfireball.net/2012/09/timing_of_apples_map_switc...