At its event on July 25, Motorola may have another handset to showcase aside from the much leaked Z2 Force and X4 - the G5S Plus. This could be announced alongside a G5S, and a new report today details the upcoming Plus model. The G5 and G5 Plus were only introduced at MWC in February, so it's a bit odd for Motorola to be ready to out their successors so early. Then again, perhaps the company felt it was very important to have dual rear cameras on midrangers before 2017 is over. Thus, the Moto G5S Plus will come with 13 MP + 13 MP sensors on the back, one color, one black and white...
Source: http://www.gsmarena.com/moto_g5s_plus_detailed_in_new_leak_55inch_aluminum_body_dual_rear_cameras-news-26073.php