In an effort to improve the embarkation process, Carnival is testing an industry-first portable embarkation system similar to what you find at car rental locations. The system allows agents using hand-held devices to electronically check in passengers from remote locations such as airports and hotels. The experiment was taking place on Carnival Destiny cruises out of San Juan, Puerto Rico. No word yet on whether it will be expanded elsewhere.
I'll try it out in 11 days if I can find the Carnival person at the airport. Anything to not have to stand in line.
I have read that it is like the pre-check in at some hotels in Miami. They process all your info. and put a little sticker on your docs so you can bypass the check in line and go right to the sign and sail cards area.