Question: I am wondering is there any options for combining existing *ARCore* early stage with Google Location in order to place AR objects over `latitude / longitude` in the real world? I know this one is possible with *ARKit* but haven't found any information on such via *ARCore*.

Any ideas?

Thanks in advance.

Answer: 
i am also creating similar app. In my case i want to display video at specific longitude and latitude, I achieved it using geo-fencing. I select a specific point and set radius around it approximately 20m. when i enter in the radius my app start showing video in that area.
I use mapbox, with arcore, you just have to do the "magic" ( when nearby location, transition to ar core scene, and put GO at approximate location ) 
I used player position, and orientation, than it lays out the level in front of the player, at the feet, with a raycast to the ground, It will only spawn if the ray actally hit a plane(tracked plane), making sure its on the tracked plane