The vivo V15 Pro was caught outside wearing a black and red gradient. And it proudly displays the "AI triple camera" label next to the 48MP module. Qualcomm claims that the multi-core AI Engine inside the Snapdragon 675 chipset offers a 50% speedup compared to older chipsets. The way the rear glass reflects light creates an interesting diamond pattern. The blue gradient seen in leaked press images has wavy reflections instead. Anyway, there's nothing no the back besides the camera because the Super AMOLED screen on the front will house an in-display fingerprint reader. vivo V15 Pro...
Source: https://www.gsmarena.com/vivo_v15_pro_photographed_with_a_red_and_black_gradient_paint_job-news-35367.php