The LG G3 S (aka LG G3 Beat, LG G3 Vigor) running Android 6.0.1 build MMB29V was recently spotted on HTML5TEST site.
As you can see from below screen shot, The browser’s user agent string (UA) mentions a LG G3 S handset with the model number D724. The handset runs on Android 6.0.1 build MMB29V.
*Please notes that the data shown above could be fake.
It seems that some one is testing Android 6.0.1 software on a LG G3 S D724 model!Is LG working on the Android 6.0.1 update for its LG G3 S smart phones.?
[Update] According to Andriy overat VK.com, the device under HTML5 test is based on CM13 Android 6.0 M Custom ROM.
In December 2014, LG G2 D802 running Android 5.0.1 was spotted at the same html5test website, and then in April 2015, LG release the Android 5.0 Update for the device.
By the way, LG official has just released the Android 6.0 M build MRA58K for its LG G3 D855 models in European countries.