Winding Slitherdrake received an Obsidian Gladiator transformation in the latest Patch 10.1 build.
Players who reach Gladiator in Dragonflight PvP Season 2 will receive a full transformation for the new Winding Slitherdrake Dragonriding mount that you can obtain from the Embers of Neltharion campaign in Zaralek Cavern.
Recently, we also covered the Elementium transformation for the Highland Drake from Aberrus that you will find here.