By keeping things secretive, Smach Z's trying to hide their incompetence. Here is part of backers only update which shows they cannot get the correct PCB maker for their boards. Those PCBs shown at Embedded World 2018 were never going to function at all, may as well call them mock ups. Quote from backers only update...
"PCB manufacturing: We have received the new version of the main PCB so we'll be able to start working with it next week. However, we had a problem with the Core PCB: The manufacturer was not able to finish the work due to lack of technology to create such small lines. So we just sent it to another manufacturer. This is a bump for the project, since it's going to delay the time to see the final unit working at least until the end of April. There is nothing else we can do to accelerate it. All PCB manufacturers take 15 days or more to produce the Core PCB."
The most appaling part is "So we just sent it to another manufacturer" with emphasis on "just". Basically sounds like trial and error, so backers will be in for a very long ride with more delays to be anticipated.