With the Rugby World Cup held in Japan in the same year, the southern hemisphere's premier rugby competition has been reduced in length, meaning the two big rivals will only face one another once.
Next year also sees the introduction of the 1985 Cup - a second chance for Championship and League One clubs to reach Wembley in a further bid to add a spark to Cup Final day, which saw a disappointing 50,672 crowd watch Catalans Dragons beat Warrington last August.
Rugby Australia were confident of securing the rights to become the first southern hemisphere nation to host the tournament after securing $10m in government funding - $7m more than what was promised to New Zealand.
"I think people will want to test themselves against the best women's teams in the backdrop of extremely knowledgeable rugby people".
There are just two Bledisloe Cup Tests being played in a reduced Sanzaar schedule because of the Rugby World Cup starting on September 20.
New Zealand's bid was presented by Black Fern and NZR Board Member Farah Palmer, All Black and NZR Board Member Mark Robinson, NZR Chief Executive Steve Tew and they were joined by video by New Zealand's Prime Minster, the Rt Hon Jacinda Ardern.
Following extensive hosting interest, the selection process saw New Zealand and Australia submit strong and compelling bids.
Castle, who was on the team of three that made a final presentation to the World Rugby Council, was disappointed but bullish after the result came through.
The tournament will be held in Auckland and Whangarei on New Zealand's north island.
All 12 teams will experience the same training facilities and hotels used to host the 2011 World Cup and last year's British and Irish Lions tour. But I think, being in New Zealand, it's still going to get great exposure here.
"This is why I think the timing is right".
"I'm really looking forward to her seeing the best of these female rugby players on our home turf that's why drives me now".
"Women's rugby continues to grow with over 2.4 million women and girls playing rugby at all levels, accounting for more than a quarter of players globally", said World Rugby Chairman Bill Beaumont.