I'm not an immunologist or epidemiologist; I don't have definitive awnser
Too soon to tell.
Then direct Vaccine against this virus may be impossible. Other indirect routes may need to be checked.
Possibly. Viruses and bacteria adapt far more quickly than humans do. Covid-19 is a novel strain of corona virus that has not been studied in humans before. It appears to mutate even more rapidly than other members of its family, and it's possible that people who have been infected by one generation of Covid-19 will not be immune to future variants.
Horrible. Then other common targets may need to be evalued. Say eg. resisting fusion and intenalization.GL.
They'll certainly produce a vaccine. It may turn out to be ineffective, or partially or selectively effective.
It's also possible (I get the impression it's starting to look probable) that people who recover from the illness continue to have some of the virus in their system; it may go dormant and undetected by such tests as we currently have available. Of course, the virologists will continue to develop more accurate tests.
Maybe.
It may not.
Medical science proceeds by trying every method that might work, then discarding the ones that don't and further developing the ones that either do or could.
As above.