Photos of a first-generation Moto G running with Android 5.1 Lollipop OS leaked online. A Motorola employee allegedly passed on the purported photos to Google Plus user Damian Junior. 

The handset seen in the leaked photos is an XT1033 model. The smartphone has a dual-SIM slot and, with the aid of the new Android 5.1 update, users can change the hue of the Dialer for each SIM card. Unfortunately, the leak did not come with a date as to when the OS will officially hit the handset. 

The 5.1 version of Android is reported to be bug-free. It is said to improve the "OK Google" function and RAM management. Other expected improvements include security in the firmware, options for Smart Lock (PIN lock, pattern lock, or a general lock toggle), Quick Settings for features such as Wi-Fi and Bluetooth, among others. 

Meanwhile, U.S. carriers AT&T, Verizon and US Cellular are currently seeding the Android 5.0.2 Lollipop OS update to the Moto X (2014). According to the changelog, Android 5.0.2 brings the new Material Design, Downtime settings, Smart Lock, Project Volta, Overview space, and New Interruption. The smartphone also gets the new lock screen notifications as well as improvements in security and performance. 

The Moto X (2013) has not received the latest firmware due to the chipset's architecture that the company is working on. There is a big chance that the handset will skip the 5.0.2 version and instead have the Android 5.1 update.