Next years theme was announced on 20th January 2020 to incoming district governors at the Rotary International Assembly in San Diego, California, USA.
Rotary International President-Elect, Holger Knaack,  member of the Rotary Club of Herzogtum Lauenburg-Mölln, Germany, revealed the 2020-21 presidential theme; 

"Rotary Opens Opportunities"

See the announcement on the RI website here.
See the complete speech of RIPE Holger Knaack here.