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I had every intention of doing a list like yours so I went to PSR and looked at the future releases- then I lost enthusiasm when I found I wanted no less than eight different sets from Caesar alone (and at least two of each) and I hadn't even got to HaT. So I did a quick count and got 37 sets that I want.
P.S. I loathe the Napoleonic period so that does serious damage to the list of upcoming sets.