Personally I think that the risk of this spreading is pretty high so I'm updating my emergency supplies at home - food (human and pet), prescriptions etc. I think one of the biggest issues may not be the virus itself but more the affect of any government or self imposed lockdown and mass sickness affecting daily services like transport and shopping. Both my wife and I can easily work from home so if it starts to spread I will just opt for that as much as possible.
I definitely won't want to go to a supermarket, doctors office or pharmacy if New Zealand starts to be badly affected.