Was able to get through by phone (not sure why the phone lines last night said they were closed until Monday), and after a long wait and a pleasant but unhelpful rep eventually transferred me to a helpful supervisor, we were able to get our flights switched to NRT still in biz with about 24 hours difference in departure date on each set of flights (there was some confusion as to whether or not we qualified as the number of miles required had now doubled) but between the situation in general and the fact that there appears to be some kind of special fare difference waiver for flights to/from Japan, they were able to make it happen. Still no information about what is going on with weekslong HA flights all of a sudden disappearing from HND... they said something about "haneda air control causing the cancellations" but that was it... Very odd.