Personally, I hope they don't play each other for a long while- a year or so at least.
My logic for this is that there was so much positivity created about the Tier 2 nations from that win that I think is going to drive Japan on in its development, as well as inspire other Tier 2 countries. It should also help spark debate, if not change, e.g. Relegation and promotion (in whatever form) in the Six Nations.
So I hope they don't play, because it was a bit of a fluke, and all a rematch would gain would be a bit of a salve on wounded Bok pride. Which, considering they lost narrowly to the irrefutably best team in the world, they don't really need.