Google on Tuesday unveiled two smartphones, Nexus 6P and Nexus 5X, preloaded with the new Android Marshmallow. Nexus 6P, (starting at $499) has an Imprint fingerprint sensor on the back, a 5.7-inch display, 3GB RAM, 12.3MP rear camera and 8MP front camera. Nexus 5X (starting at $379) has a 5.2-inch screen, 64-bit Snapdragon processor with 2GB RAM and 12.3MP camera.