According to this report:
In a question-and-answer session, [Justice Ginsburg] said the nine justices only take pictures together when a new member is added. She said: “We haven’t had any of those for some time, but surely we will soon.”
That seems quite a strong statement that Ginsburg expects a vacancy no later than this summer. (One could imagine that Ginsburg has a longer time horizon in mind when she says “soon”, but that seems difficult to reconcile with her concept of “some time” ago: Justice Alito joined the Court just over three years ago.)