They have. It is clearly stated right here:
Furthermore, a second bonus event is planned to be held from 2 January 2014 3:00AM GMT to 30 January 2014 3:00AM. Again, this event will allow you to win up to 6,000,000 credits when combined with the Consecutive Log in Bonus, so if you participate in both special events you could earn up to 12,000,000 credits!
I understand this is about the seasonal events but do you not think that the Red Bull event will also be released at this time. I truly believe that PD meant Jan. 2nd like the scheduled release of the seasonal