Death toll of those that have had it, in China, and are now well again seems to be running at about 1% so no where as dangerous as SARS where the death toll was 14-15% with it running at over 50% in the over 65s. As of yesterday the numbers in China are: 40171 confirmed cases and 187,518 under medical observation. The daily infection rates in China are dropping from a peak of over 3,000 to under that yesterday.
The UK person that caught it, at a conference, in Singapore, a super spreader, then went on holiday to France and then back in Brighton who has given it to a few more people including 2 GPs. I will be surprised if we don't now have a pandemic in the UK where it spreads very easily as an airborne virus by somebody before they know they have got it!
For the majority it will be a mild illness but a percentage will get viral pneumonia and 1% will die. This will be mainly older people with other medical conditions. The key to survival with pneumonia is getting treatment early, if you don't you can't be saved. My wife has had pneumonia several times and she has been to her GP and then hospital treatment, another person I know who left it late was told by the doctors that if he had left it another 24 hours they would have not been able to save him where he spend 2 weeks in our local hospital in an isolation room having treatment. When I went to see him I have to dress into a paper protection suit, hair cover and mask to see him.