I received the following responses, made a correction above, and here's the rest:
I have to precise that Own-Mailbox, is not a usb-plugged device, but an ethernet-plugged device, and you don't have to carry it around with you, but leave it at home.
For the beta the answer is yes, we will announce it with the Kickstarter Campain.
Note that users won't have any trouble with port forwarding, or anything to on on their own. and we will guarantee that in any situation, you will be able to access a confidential mailbox from anywhere in the world.
Own-Mailbox, is not a service but a device. The brain is in your own-mailbox, at your home.