wow what a messed up situation. I saw the headline about a Japanese exchange getting hacked but hadn't read into it until your article.
I hope NEM do something to compensate at least in some way people in your situation.
They won't do a hard fork as that is way too messy, be just a logistical nightmare to try and fix it that way I imagine.
Hopefully the thieves that did it leave a trail and they can get it back before they get the coins off line. Good luck you and everyone else affected has my deepest sympathies