ICC did not reveal the name of 2021 and 2022 World Cup host country, but...

While the ICC has officially postponed the T20 World Cup to be held in Australia this year, the ICC has also released the schedule for the next three World Cups. The ICC has announced the 2022 T20 World Cup and the 2023 Cricket World Cup, along with the 2021 T20 World Cup.

The 2020 T20 Cricket World Cup was to be held in Australia, while in 2021 it would be hosted by India. It has now been decided to postpone the 2020 Cricket World Cup in 2022, but Australia can host this World Cup rather than India and the BCCI can give Cricket Australia the rights to host the 2021 T20 World Cup.

That is, India can host 2 big tournaments in 2 consecutive years, and this is why the 2023 Cricket World Cup has been extended a few months ahead. It remains to be seen when BCCI announces the IPL 2020 event.