The first three are possible; the fourth is not. The first and third are natural.
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Mister Micawber#4 is not possible because a possibly interesting future event cannot be interesting now.If (4) is not possible for the reason you've just stated, which one do you think is the most natural in my earlier context of having a reunion?
Robert Marmaduke(3) and (4) are not correct#3 is fine under the right circumstances: a recognition anticipated in a moment.