An interesting observation was made regarding the packaging design for the new Black Series 4.0 assortment. Hasbro may be hinting at future accent color usage in the line as the top right tab on the packaging doesn’t match the overall color accent of the box.

BOX ACCENT COLOR / TAB ACCENT COLOR
Kamino Clone (Yellow) / Red (used for AOTC)
Teebo (Green) / Dark Brown (used for The Mandalorian)
Ackbar (Green) / Tan ?
Mandalorian (Dark Brown) / Light Pink ?
Stormtrooper (Dark Brown) / Eggshell Blue ?
Darth Vader (Blue) / Purple? (different from Rebels color)

Thanks to TatooineSandworm for the tip.