The cruise announcement page states near the top "$660 PLUS tax, port fees and tips".
The registration form states pre-paid gratuities are an option.The cabin category/fares page also states that pre-paid gratuities are optional.
Most cruise lines have now gone to this pre-paid option as passengers very often don't want the hassle of tipping various dining and cabin crew on the day or night before arriving at the home port. Among other things, sometimes you have to make a special trip to the purser's office deck to get proper bill denominations. I have found the pre-paid gratuity option to be a great convenience.
Thanks for your question, and hope to see you aboard!