I really don't know BUT:
is a relatively new airport, it was most likly designed around the 80m box
2) The A380 doesn't require much change to any airport that a B747 can use, subject to certian site specific restrictions. I dont think NRT
has any of these.
3) Purely from my own obversion it seem that the outer satalite, at least, of terminal 2 could fit the 80m box without any real problem. If fact the end gates there look like they could take an AN225 with only line marking changes. The SK
A343 we arrived on in January look really small out there.