The new keyboard from LG G3 is now available for Android devices running Lollipop (Android 5.0) or higher. This is a port which has been released by senior XDA member fLipz. The port has been successfully tested on a number of Android devices including Nexus 5, Galaxy S5 and Galaxy Note 3.
Video:
LG G3 Keyboard Preview
How to install LG G3 keyboard
Download LG G3 Keyboard
Copy the downloaded file to the internal/external SD card of your device
Reboot the phone into recovery mode
Perform Wipe cache and dalvik cache
Install the keyboard
Perform Wipe cache and dalvik cache
Reboot the phone
When the device reboots successfully, it should have the LG G3 keyboard.
Note: After installing the keyboard, navigate to Settings>> Language & Input, from there select Default Keyboard to LG.
If the keyboard force closes, then go to Settings>> Apps and clear data of LG keyboard.