Click here to go to Jeffhead's site on this and other aircraft carriers/amphibious assault ships. About the same size as the Australian ship but carries more aircraft. According to articles I've read it carries vehicles and around 500 troops. I haven't seen the ramp to allow roll on roll off of vehicles but if it isn't at a crazy angle (which it shouldn't be) and if they get AAVs, they should be able to launch them (recovery might be an issue....I'll have to check).
Long story short. The Japanese just developed a pretty nice sea control ship with a minor amphibious assault capability. That will be the next issue. If they want it to flex into the LHD role then they'll need to get an effective troop carrying helicopter.
It'll be good to watch a Navy put its ship into service without its leadership hoping that the sailors that use it figure out how things need to be done or what roles it can fulfill (direct hit at Greenert and the LCS).