http://www.carnival.com/loyalty/faqs.aspx#q-1197330
Q: I have already sailed with Carnival before, and previously received a color-coded Sail and Sign card. Will I be “grandfathered” into that group in this new VIFP Club?
A: Guests who have sailed with Carnival on more than 10 cruises will be automatically included in the Platinum level of the VIFP Club. Additionally, some guests who previously received Platinum cards will now advance to the VIFP Club’s Diamond level. All guests who have sailed with Carnival fewer than 10 times will be placed in the level that corresponds with their VIFP Points (i.e., cruise days). Guests with fewer than 25 VIFP Points will be placed in the new Red level. Those who have earned 25-74 VIFP Points will be in placed in the Gold level. Some exceptions apply; please see below.
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.