The big day for wealth watchers is almost here. On Thursday, BRW magazine will release its annual Rich 200 edition, which promises to be one of most fascinating in years.

The headline story shouldn't be too much of a surprise. Based on what we've seen from the Forbes list of the world's billionaires and the Sunday Times Rich List, Australia's wealthiest entrepreneurs will have lost about 30% of their total wealth, or around $40 billion.