Is there ant information or updates as to when these may make an appearance?
The current options for additional Mics with the studio bars is very limited - and a 7 meter cabled option (Debut Expansion) is not really an option in most scenarios.
I would say there is nothing more to come. If you want to use external mics, use a Trio in controller mode or the external Studio USB mic. If 7.6m cable is too short, use the adapter kit 2215-88019-001.
Unfortunately, a Trio is not a mic extension but a full replacement. It moves the mic pickup from the X device to the trio, effectively moving the issue elsewhere in the room. At this point, the X device mics are now disabled. It is also a very expensive way to do this v the IP mic the G7500 can use on teams.