My impression is that the works are still far from being regarded as finished, otherwise Ray would have provided a probable launch date (at least for the beta version).
After more than three years, I think it's legitimate to ask for clarification. PHP7 is currently the standard and it is impossible to use Data Bridge on new web projects.
P.S. In the next weeks Adobe will release the new version of Dreamweaver CC (2018 version) and I hope that WebAssist has verified all the various compatibility issues in the Adobe Prerelease program.