World Athletics announced the new statement regarding Tokyo 2020 as following:

The IOC, IPC, Tokyo 2020 Organising Committee and the Tokyo Metropolitan Government announced that the postponed 2020 Games will take place from 23 July to 8 August 2021.

We support the new 2021 dates for the Tokyo 2020 Olympic Games announced today by the Japanese organisers and the IOC. This gives our athletes the time they need to get back into training and competition. 

Everyone needs to be flexible and compromise and to that end we are now working with the organisers of the World Athletics Championships in Oregon on new dates in 2022 for our World Athletics Championships.  We are also in discussions with the Commonwealth Games Federation and the European Championships.  We would like to thank our Oregon 21 Organising Committee, their stakeholders and our partners for their collaboration and willingness to explore all options.