Wuhan is causing respiratory infection that leads to pneumonia. H1N1 caused inflammatory immune reactions (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4711683/).
So far this virus seems closer to a bad seasonal influenza. 2% mortality rate concentrated in populations over 65 years old. The 2019 Li paper in Lancet had similar numbers in China for the flu. Similar reproduction rate.
I'm not an expert, but some people are are panicking and buying surgical masks (borderline useless) and food supplies. Mass panic reactions are deadly and avoidable.