Current run rate for reported cases in China is 3+% fatality.
As hospitals fill, the number will go higher.
That may be. But there has to be more than "contagious for 5 days without symptoms" and "3% lethality". It's pretty simple: if you are infected, and are contagious, then you will have enough virus to have symptoms. If those symptoms are not noticeable then the virus is not lethal at that point.
If there are two phases: first a low level of infection, some contagion, no or very mild symptoms; followed by high level of infection, much more lethality and obviously contagion, then that is a possible explanation.
I don't know. I'm just telling you that in the simplest case it cannot be lethal and contagious without symptoms.