While most of the new features found in Apple’s upcoming iPhone 6s and iPhone 6s Plus are already widely known, there are always a few changes and upgrades that seem to slip through the cracks. Here’s our effort to bring some of those overlooked features and tweaks into the light. Bigger, but barely — Both new iPhone models are slightly larger than their predecessors. iPhone 6s is 138.3mm x 67.1mm x 7.1mm, as opposed to the 6 measurements…