We buried this tease at the bottom of the newest blog post 
What do you think it will be?
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(Reassuring footnote: we're not putting any Thunderbird features behind a paywall)
@thunderbird I'm glad to hear you're not considering ads. Hopefully you'll as vociferously object to cryptocurrency/proof-of-work schemes.
@adamhotep As an organization, we align with Mozilla's stance on this. We're against proof-of-work cryptocurrencies, and will not even accept them as payment methods for donations.
https://wiki.mozilla.org/Foundation/Cryptocurrency_Donations#Q2_2022_Update
wiki.mozilla.orgFoundation/Cryptocurrency Donations - MozillaWiki