Apple is poised to release iOS devices with much faster quad-core processors later this year. The first device to feature the next generation A6 processor could be the iPad 3 this spring, however there are now rumors of an iPad 4 in the works for October 2012. Regardless, the A6 is the logical next step for Apple to take in their mobile devices.
The A4 was featured in the original iPad, and upgraded to the dual-core A5 chip in the iPad 2. According to research from 9to5 Mac the latest iOS 5.1 beta source code contains evidence that Apple is indeed working on a quad-core processor. Processing core management software has been adapted in iOS 5.1 to add "/cores/core.3" according to the report, which represents a fourth processing core.