ah...found some info...
GROOVY COLORS: Two hundred million packages of M&M'S Chocolate Candies are feeling the artsy groove of the '60s and '70s with hip new packaging. Designed by Michael Rios - noted for his Santana album covers and the latest from Steve Winwood - the packages feature swirling primary colors melding into the candy logo.
In addition, festive, multicolored candies are mixed in with the regular bunch. And if you find a bag that contains all groovy, multicolored M&Ms, don't toss it. You could win one of 50,000 prizes, including a grand prize of $5,000 every summer for life. The prize information is on the inside of the bag.