Their FAQ still states:
More Information | Cruise Loyalty Program | Carnival Cruise Lines
Q: I was only a sail or two away from becoming Platinum in the previous recognition program. Is there anything I can do to reach the Platinum level?
A: We understand the investments guests have made over the years, and we’d like to thank and acknowledge guests who were near advancement in the previous program.
Any guest that sails at least 10 times by December 31, 2013, will be grandfathered into the Platinum level under the old program rules.
And, once a guest begins his/her 10th sailing, s/he will be considered Platinum in the new program on that 10th sailing.
Cruise Cat (Chuck)
Carnival Magic - 8/26/2012
Carnival Breeze - 1/19/2013
Conquest - 2011, Oasis B2B - 2011
Conquest-2010, Ecstasy-2010, Conquest-2009,
Ecstasy-2009, Brilliance-2008, Miracle-2007,
Conquest-2006, Rhapsody-2005, Vision - 2003,
Rhapsody-2002, Inspiration-2001, Jubilee-1999