Governing body SANZAAR has confirmed the 12-team tournament would kick off in 2022, bringing Pacific islands teams into the southern hemisphere provincial competition for the first time.
New Zealand's teams won 23 of 25 games against their Australian opponents in Super Rugby Trans-Tasman in May and June, underlining the gulf between the nations' rugby programmes.
"I think if you look across the board at the competition next year, you're going to probably look at a 90%, 80% win rate for New Zealand teams," Read told Sky Sport.