In terms of infections outside of China, this will likely peak by 15 Feb 20. After that, it will most likely show a sharp decline. This is due to the travel bans implemented by the various countries.
For within China, infections will probably continue to spread until Apr to May 20. Like SARS it will most likely disappear with the onset of summer.
The total number of infected in China is estimated to reach 1 million to 1.5 million. Of these, 800k to 1.2 million will probably have a mild form of the disease which is similar to that of the common cold. There will be 200k to 300k who will get a severe form of the disease that require hospitalization. Of these 30k to 45k will die from the disease.