Finally terms make sense:
a circuit (or part of it) attends a circuit assembly with the circuit overseer present and alternating visits by the district overseer and a branch representative
a district convention was not always attended by the district overseer and never assembled exactly all the circuits forming a district visited by the same district overseer (with some exceptions in smaller countries perhaps), so speaking of regional conventions makes sense
a zone overseer never visited a zone but got a yearly appointment to visit a number of branches, so it is overdue to abandon the use of the terms "zone" and "zone overseer"
it seems branch visits by headquarter representatives will no longer include a special meeting for a selected few, but will be transmitted to all congregations in the branch territory, so the lacking day of the circuit assembly will be compensated for
and/or the agm may become a regular feature for all to attend...
so not surprising but quite reasonal decisions
LL