A new date will be communicated in due course

A very diplomatic and vague response!

In essence, this phrase is saying that a new date will be announced at some point in the future, but the exact timing is not yet known or has not been decided. It's a way of keeping people informed that a new date is coming, without committing to a specific timeline.

Here are a few possible reasons why someone might use this phrase:

1. The new date is still being finalized: The person or organization may not have a confirmed date yet, but they want to let people know that a new date is in the works.
2. The new date is dependent on external factors: The date may be dependent on factors outside of their control, such as weather, availability of resources, or other external circumstances.
3. The person or organization wants to maintain flexibility: By not committing to a specific date, they may be leaving themselves room to adjust the schedule if needed.

Overall, "a new date will be communicated in due course" is a polite and professional way to keep people informed without making promises that may not be kept.