Modern Warfare Remastered has a camo that is higher than the Gold Camo, images from the in-game menus have confirmed.

If you complete unlock Gold Camos for every single weapon in each class (ARs, SMGs, etc.), you will unlock the Regal Camo for that specific class.

This higher-ranked camo unlock is very similar to Advanced Warfare’s Royalty camo, that was unlocked after Diamond.