What most here don't understand: this is only the access at home. You won't have twice more fun than with google's solution because
a) the backbone infrastructure will most probably limit the bandwidth as this is surely not ready for costumers using their 2gb/s.
b) peering partners in japan will not be ready to such a demand
c) traffic has to come to japan and transported back to foreign countries
By now, it is a very nice marketing move but users won't have much benefit of it. As I read, they just bring a lightweight onu to customers (onu's are nothing new) with 3 gige-interfaces (nothing new) and a standard 802.11-technique. I would gladly see bandwidth-tests that are testing servers outside of japan (and preferebly not something this isp provides).