MicroStation CONNECT Help updated 17-Mar-20 has a What's New section. There is a list Features Moved from Technology Preview to Commercial Release. Each member of that list has a link to its help content.
The list includes...
However, the link to Ability to Create and Edit User Coordinate System has the same URL as Components Center. In other words, one can't reach the User Coordinate System content.
Thanks Jon for reporting I will pass this information on and have this corrected. The following link may help in the mean time https://docs.bentley.com/LiveContent/web/MicroStation%20Help-v16/en/GUID-08E26754-2304-1002-2E96-BFFC28F4214F.html