Recent travelers to LV have reported several new variations of the MGM Resorts M Life cards, all with new manufacturer mark C#s on the back.

Grey Platinum level with C-00254893AP

Black NOIR level with C-00254893AM

Blue Sapphire level with C2-00254893AO

Blue Sapphire level with C2-00254893AI

Scans of the newly found cards are on the ChipGuide now if you need to see what they look like. They're all the standard design with the new C#s.