>> what is the 'design team'?
Even though the design team (as it used to be) is now split out under different managers with no centralized Director, we still consider ourselves a "team" in that we still work together across teams to maintain consistency and provide feedback, collaborate, and review one another's work where needed. We have a weekly meeting and regularly talk and brainstorm in person across teams to support one another in our work.
Design Research is the team that conducts research that informs the design of products we build on all other teams. The employees on this team are not designers.
Reading Design is a sub-team under Reading, and it designs reading experiences, mostly for mobile platforms. Where you see "Visual Designer" as a title, that person works on visual designs. "UX Designer" works on combinations of visual and user experience design, mostly the latter, and "UX Engineer" builds interactive prototypes and interaction design.
The reorganization that you reference happened in late April this year and was not a decision the design team itself made. Rather, it came from upper management. We do now work within the teams you see listed on the staff page, on experiences for those teams specifically. So for example, you will not see a designer on the Search & Discovery team working on experiences for the Editing team.
Is there a particular concern you have about this organization that you feel like we should be discussing, or does this answer your questions?