The Nokia 8 model leaked earlier was Tempered Blue in color, one of the prominent colors for the recently launched Nokia Phones like Nokia 3, 5 and 6. This may be a good enough hint about the existence of Matte Black, Copper and even Arte Black models for Nokia 8.
As per various rumors and leaks, Nokia 8 may be the 4GB RAM variant TA-1004 that has leaked at Geekbench, FCC and in other places. It will be powered by Snapdragon 835 and come with 64GB storage. It will also come with 13MP Dual-Lens Zeiss camera on the back.