In my opinion, it's not exciting at all. From what their website says, it's a standard Android handset shipped with some preinstalled apps: https://www.blackphone.ch/phone/#software
No virtualization, micro kernel layer or something, no difference to any other contemporary smartphone after it's been configured to use an encrypting messenger app, VPN and file(system) encryption or encrypted containers. The improvement is to bring a consumer product close to an enterprise grade setup.
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