Some more changes are coming for the drink packages. I was on the Rock Legends cruise aboard Liberty Of The Seas last week and a favorite bartender of mine (I've been on Liberty a lot lately) told me the packages were being rolled out to 4/5/6 night cruises too. He said they were going to start selling them 'next month'. So it seems that only the 3-night cruises will not have the booze packages.
Also, the price does include gratuities so when they say $55 it will not have an additional 15% tacked on.