How predictable is Qantas' bonus point earn with voucher offer?

Frequent Flyer Programs
1

Are Qantas relatively predictable with their offers? I.e. their earn bonus points with voucher offer seems to pop up in December most years…

Looking at booking flights to the U.K. and wondering if we can predict possible upcoming offers prior to booking.

2

Their bonus point offer is about the most predictable one out there, and they sometimes run incentives to get people booking in January also.

Beyond that, there doesn’t seem to be much of a rhythm on their bonus offers.

3