Looks like they still need to officially update the accounting standards, but that this is definitely the direction of travel.
The Board directed the staff to draft a proposed Accounting Standards Update for vote by written ballot, with a comment period of 75 days.
This is from this page dated 8 Feb 2023: https://www.fasb.org/Page/ProjectPage?metadata=fasb-Accounting-for-and-Disclosure-of-Crypto-Assets
Hasn't this changed October last year? Michael Saylor also mentioned this problem.
But seems like the FASB pivoted and decided that fair-value accounting for crypto assets should be used: https://www.coindesk.com/business/2022/10/13/fasb-mulls-fair-value-accounting-for-crypto-holdings-report/