While I am not going to use ever again the coordinator that zkSNACKS and their chain surveillance friends control, and Trezor Suite which is terrible for privacy in general, I am somewhat optimistic about this news. Currently, in order to participate in a CoinJoin transaction, you have to have a hot wallet containing private keys to the inputs you'd like to CoinJoin so that a signing process can be done automatically without the direct participation of users. In short, the software has access to these private keys and can use them directly to sign transactions for users. In hardware wallets, however, private keys are isolated from software access, and users need to sign every transaction manually. A CoinJoin directly from a hardware wallet has seemed so far like a pipe dream, but it may be that Trezor developers have found a way to make hardware wallet CoinJoin possible? If so, then other developers will also be able to implement CoinJoins in their software interfaces for hardware wallets, adding different coordinators and implementing different, even decentralized, CoinJoin solutions.