A couple troubling stories came out in the last 24 hours or so.

First, this from Taiwan News: https://www.taiwannews.com.tw/en/news/3876197.
Exclusive: Chinese doctors say Wuhan coronavirus reinfection even deadlier
Instead of creating immunity the virus can reportedly reinfect an individual and hasten fatal heart attack

And there's this from that story:
"The source also said the virus has “outsmarted all of us,” as it can hide symptoms for up to 24 days. This assertion has been made independently elsewhere, with Chinese pulmonologist Zhong Nanshan (鍾南山) saying the average incubation period is three days, but it can take as little as one day and up to 24 days to develop symptoms."

But probably more troubling for us here in Japan is this story, which I'm surprised hasn't gotten wider coverage: https://www.hawaiinewsnow.com/2020/02/14/governor-japanese-visitor-recently-hawaii-conf...
Couple diagnosed with coronavirus after returning to Japan from Hawaii vacation

This couple had never been to China and had not been in contact with a known sufferer of the virus, at least that's what I glean from the article. Assuming the contracted the virus before getting on the plane to Hawaii, or on the plane, that means the virus is circulating among the general population in Japan.

If you combine the new information of these stories, a 24-day incubation period and the fact that the virus is now in the general population outside China, the implication is that we're about to see an alarming increase in cases both in Japan and around the world.

EDIT: Confirmed - http://www.asahi.com/ajw/articles/13130630. There are people getting it all over Japan, including Hokkaido, which is very remote, and Okinawa, so basically from one end of the country to the other.

Also see http://www.asahi.com/ajw/articles/13132892.