I received an email today from My Coke Rewards stating that today only you could get double points for codes entered (ends 1/25 11:59 pm EST).
The email doesn't state whether it's only good on certain beverages or not but the codes that I entered didn't double (at least immediately anyways ~ they may show up later?). I have also heard rumors that it is only the coke classic ones that are working. Either way I figured it was worth a shot. =0)