Indoor Navigation and Better Connectivity
Based on multiple separate reports, Apple is likely to upgrade the wireless connectivity of its new iPhones across the board. A couple of those reports hint that the 2019 iPhone lineup may feature Ultra-Wide Band (UWB) support, which could allow for better navigation and positioning features when indoors. (Think indoor mall navigation, for example.)
Apple may also be planning on adding the 4×4 MIMO antenna design to its iPhone XR successor, allowing for better LTE speeds. Wi-Fi could be upgraded to 802.11ax across the board, bringing better data rates and performance to Wi-Fi networks. Users may also be able to connect two separate Bluetooth devices to their iPhones simultaneously.