Apple wants the A6 in full-scale production by the first quarter of 2012 and will need decent yields to meet production targets. Apple will also need permission from some patent holders to make them, as well.
Apple might want to lower its dependence on Samsung for parts, considering that the two are locked into a major court battle around the globe, relating to patent infringement. On October 13th, a District Court in California is set to hold a hearing on Apple's request for a preliminary injunction which would prevent the Korean based firm from selling certain phones and tablets in the U.S. including the sizzling hot Samsung Galaxy S II and its Apple iPad competition, the Samsung GALAXY Tab 10.1. In France and Italy, Samsung is asking the courts to block sales of the recently announced Apple iPhone 4S.
Apple might also want to use TSMC because the company can get to 28nm production faster than other firms. TheNVIDIA Quad-Core Kal-El is built using a 40nm process. The first Apple product with the A6 will most likely be the Apple iPad 3, expected out next March.