The only info available:
https://www.ittf.com/wp-content/uploads/2019/11/2020_WT_1_GER_PROSPECTUS-1.pdf
Theoretically, things will go according to WR in May but I've gotten used to all the ass pulling by ITTF.
So, has the world ranking settled 2 years later? Number shown is seeding as of Jan, 2020.
WT
1 HKG
6 AUT
8 POL
10 PRK
3 SGP
7 HUN
5 ROU
2 TPE
4 KOR
MT
1 KOR
11 SLO
9 CRO
3 SWE
4 FRA
8 POR
27 SRB
2 TPE
10 HKG
Yes. Germany qualified by winning the team event at the European Games last year. China qualified by winning the ATTC team event last September. Japan is the host and exempt from qualification.
https://www.ittf.com/wp-content/uploads/2019/07/Tokyo_2020_Teams_List_2019_12_20-1.pdf...
On the 24th, the JTTA has formally announced their WTTC line-up. Sato is in. Kato is out. Also, the July World Ranking List will be used for seeding.
https://hochi.news/articles/20200124-OHT1T50093.html
The Olympic table tennis group seed order is determined by the world ranking in July...