I don't really believe in that Minnie anymore... even if I would have loved to experience it.
Klytàmnestra, Ortrud, Kabanisha (?) and even the old countess in Pique Dame come to mind.
And Kundry and Judith , of course.
Elina Makropoulos will happen at Covent Garden in 2020, I read.
It will be interesting whichever role she will take!! I could ask her about the roles next time I see her, but usually she can tell me the ones that are official information. But we'll see!
I also found this: https://www.verbierfestival.com/en/concert/lun-29-juillet-19h00/ Karita will sing Duparc, Brahms and Strauss at the Verbier Festival, Switzerland on 29th July 2019. If I understood correctly, her pianist will be Evgeny Kissin! At least Mr Kissin is performing with Leonidas Kavakos in the same concert. If that's the partnership for Karita's Lieder, it will be the Earth moving.