The new processor has been optimized for dual-camera handsets, featuring a 12-bit Dual ISP that supports up to a 24 MP single camera or a 13 MP + 13 MP dual setup, as well as HDR video with full preview.
http://www.notebookcheck.net/MediaTek-announces-the-Helio-P25-octa-core-processor.196440.0.html