Oppo already launched its first dual camera phone, the F3 Plus, but that focused on selfies. The Oppo R11 could become the first to have a dual cam on the back, though specs uncovered in the GFXBench database show that we can still expect solid selfie photography. The benchmark detected a 16MP main camera (it can't tell the difference between single and dual cams) as well as a 20MP selfie camera. Both are capable of 1080p video (but not 4K). The rest is as expected - an octa-core processor (a Snapdragon 660 SoC perhaps, the older 650 is possible too), 4GB of RAM and 64GB of built-in...
Source: http://www.gsmarena.com/oppo_r11_uncovered_in_gfxbench_database_dual_16mp_main_camera_20mp_selfie_cam-news-24456.php