Mars Inc. has announced that a brand new M&Ms candy flavor will be coming out next May. The newest flavor will be Birthday Cake. It wasn't revealed if the candy will taste like vanilla, chocolate, or another variety of cake. Mars Inc. recently debuted the limited edition Pumpkin Spice M&Ms that are for sale at Target. It isn't yet known if the Birthday Cake M&Ms are a permanent fixture or if it is just a limited edition like the Pumpkin Spice variety.