I'm sorry to say we still didn't manage to get 6.3 done. I expect it will take about a week to get a beta release out to the public. I did setup a demo so you can have a look. In this demo "Notes" is our pilot module for the new framework. This module is now an example of how the rest will be refactored as we progress later in the year. See also our roadmap at https://www.group-office.com/roadmap
You can login with user and password "demo" here:
We will update this demo regularly the next upcoming weeks.