I've had look at the FIA grading list, and these are all the Grade 1's that don't have a race next year.
Dubai Autodrome
Fuji Speedway
Whichever German track doesn't host the GP
Imola
Indianapolis
Mangy-Cours
Mugello
Paul Ricard
Red Bull Ring
Valencia Street Circuit
All we know so far is that it will be in Europe, Istanbul no longer has a license, and Valencia have confirmed it wont be them.