I released it a week ago. It's moving along pretty well! The USB emulation method works well, as it can support any browser. So far, I haven't gotten too much push back from the more hardcore security crowd, since I'm upfront about the fact that it is a software implementation.
Personally, I think that the main blocker for adoption of passkeys is ease of use, as if you can't transfer your credentials either off of your device or away from your Apple/Google/etc account, then I think it will be a hard sell to users.
Personally, I think that the main blocker for adoption of passkeys is ease of use, as if you can't transfer your credentials either off of your device or away from your Apple/Google/etc account, then I think it will be a hard sell to users.