From an email received a few minutes ago:
COMPLIMENTARY EXTENSION OF EXPIRING KRISFLYER MILES AND KRISFLYER MILESTONE REWARDS
To offer you greater flexibility as you plan your travels in the coming year, we will pause the expiration of KrisFlyer miles in 2022. This means any KrisFlyer miles that are expiring between January and December 2022 will be automatically extended in your account by 6 months at a time, at the end of each month. For example, KrisFlyer miles that are expiring in January 2022 will be extended to July 2022 at the end of January 2022, and if unutilised by July 2022, they will be extended to January 2023.
KrisFlyer Milestone Rewards expiring in 2022 will also be extended to 31 December 2022, to offer you greater flexibility in utilising the rewards earned from flying with us.