The essence of this is update is change to the underlying identity model used by ScoutsTracker. The old model identified all badge progression, qualifications, emergency info using a “member ID” which referred to a specific entry in your account's roster. This meant that all the records associated with a member in your account were “owned” by that member, and were specific to your account.
That has now been changed by the addition of a new over-arching “Person” record, that is independent of the account. This includes fields such as your real name, your SC Member #, your birthday, etc. I.e., fields that aren't impacted by whether you're a Beaver or a Scouter.
So a member in a Section actually has a significant chunk of their information stored in the new Person record, i.e., all member records now actually just reference a specific person record where account-independent fields are stored. A key advantage is that a multiple member records can now all reference a single underlying person record. I.e., this means that they all now share common fields such as name, birthdate, SC Member #, etc.
But even more significant is that all the badge progression, qualifications, emergency info records are linked to a account-independent person record, rather than an account-specific member record. And this means that if there are multiple members who share the same person record, they also now share the same badge progression, qualifications, etc. So if a linking White Tail completes an OAS requirement, that accomplishment is instantly visible in their new Pack. Or if a Pack Scouter recertifies their Standard First Aid, then the other sections that Scouter helps out with will also see that updated qual.
The linking of member and person records has also enabled some other function. For example, a Scouter can add a member to their roster just by using a “Scouting Role ID” from a different account that the member is involved in.
And members can be identified as being the same “person” by using an “Add Other Scouting Role” button.
This same mechanism now allows parents to fetch their kids' Scouting Role ID's (via a new “Moved to a Different Group” button) so that a Scouter in a new Section can add the youth to their rosters.
The information about members in your Section are now presented more like a resumé, with a section about the person, a section about their current Role in your Section, and a listing of all their other (past and present) roles in other Sections.
Finally, there are a couple of new fields associated with the person, most notably there is a “Pronouns” field by which you can specify the gender pronouns that a member would prefer people use.
The use of a common Person record now means that Scouters have record their birthdates. And, there's a new “Left the Section” date field for members.
This is very far-reaching change, so more detailed information can be found