More information, thanks to redon from Arlong Park Forums.
In Jump cover we can see Luffy, Yamato and Momonosuke (adult dragon form).
In cover Color Spread we can see some characters that are No. 2 of their groups. Zoro and Bepo appear in the front in full body. Then we can see the faces of these characters in the background: Marco, Killer, Katakuri, King, Ben Beckman, Silvers Rayleigh, Sabo, and Shiliew.