There are a lot of help pages about this:
"Does this mean Leaders who aren't running projects are being jettisoned?" No. It's just a new name for "Leaders." Leaders are required to lead/colead a project, so it's just a name change.
Team Leaders are leaders of teams within the scope of a project. In Categorization, we have 4 badged Team Leaders.
Project Coordinators are still coordinating.
RJ, me, me, me … pick me for your team … purty pleeeez
oh goodness gracious now............