With New York closed down, New Jersey close to shut down, I wonder if products could make it to warehouses. There is a lot more to releasing a new model than we may realize. For example, service center people must be trained, new tools may be required, spare parts stocked, software updated, and the Canon USA service centers are closed.
I think there is a realistic hope for things to start opening up around the end of June, but we really don't know.
Then, there is the question of who will have money to buy them. Many people are out of work, including wedding photographers. Purchases of a wedding camera (5 series) may be delayed by many potential buyers. Presumably, older buyers have more funds, but they are also more likely to get sick and the smart ones are laying low.
I'm thinking that the folks in Japan may be a little out of touch with how bad it is in the rest of the world. Japan is doing much better than other crowded and highly populated countries.
The development and availability of mass testing for millions is coming, that may help plan for the future.
I think the idea of a 5 series Mirrorless is something I look forward to, but I don't expect to see one in a nearby shop before August or September at best.