Ice breaking, Catamaran, SWATH, variable draft. At the very minimum this has to be a challenge to the Marine inspectors.
http://ww1.matsugov.us/ferry/index.php?option=com_content&view=article&id=6&Itemid=2
http://www.militaryphotos.net/forums/showthread.php?177898-Successful-launch-of-Susitna-Ferry
Implications for the Arctic?