Yah. I noticed how big it was on the ending credits as well. Check out some hypothetical specs on aviation week. Something about this thing reminds me of the Hunter-Killers from Terminator... except its the sea version.
http://www.aviationweek.com/aw/blogs...0-0e6ebde3ec60
A 30 day trail duration is the goal so no doubt it has to be big for that kindof fuel endurance.
What I'm curious about is the unit cost. Its about 260 tons without a crew or need for great pressures, so that's good for cost savings... however it will need multiple top notch sonar tranducers which will be expensive. I'm going to guess 120-220 million dollars per unit. That's about 1/10th the cost of a SSN.