FAQ is a bit confusing. They say there's only one keyring, but at https://github.com/google/end-to-end/wiki/Keyring they admit it was not a great idea and that they're splitting the responsibilities.
Based on the last planned implementation (External Key Manager (GnuPG bridge, other hardware, network oracle etc..)), I hope it will "just work" with hardware keys.
Based on the last planned implementation (External Key Manager (GnuPG bridge, other hardware, network oracle etc..)), I hope it will "just work" with hardware keys.