ARM introduced a new CPU design - Cortex-A73 (aka Artemis), a small but important upgrade over the current A72 found in most flagship and upper mid-range smartphones and tablets. Perhaps the key change is size - the new design is physically 25% smaller than the one it replaces. This will allow chipset makers to create hexa-core designs (2x A73 + 4x A53) that are the same size as an octa-core A53 processor. This means you get a huge single-core performance boost at the same cost (the cost of silicon chips is proportional to their size). Basically, ARM sees chipsets like the Snapdragon...
Source: http://www.gsmarena.com/cortexa73_will_improve_flagship_battery_life_midrange_performance-news-18498.php
