The inaugural show from 7-11 June 2017, aims to attract 20,000 visitors a day. The plant pavilion will ape Paxton's demolished great conservatory.
Plans are underway to organise logistics for the event, which will be the RHS's first big new show since Tatton Park in 1999.
HW revealed the plan for the show in June 2015.
The RHS has recenty announced that its show at Tatton Park has a new five year sponsorship deal with Bruntwood.
The charity will not be at Gardeners' World Live (16-19 June Birmingham NEC) from this year. GWL will take place shortly after an RHS show at Harlow Carr (10-12 June) and before an Aztec Events show at Blenheim (17-19 June).
The RHS also plans a rose show in London on 3-4 June.
Meanwhile, the first RHS on tour show, held at Wimbledon Farmers' Market was better received by nurseries than its predecessor, Secret Sundays, which began and ended in 2015.
Further 'on tour' events, featuring the new RHS VW van, will be at farmers markets in Parliament Hill (30 April), Blackheath (15 May), Colombia Rd (19 June), Lambeth (16-17 July) and Marylebone (11 September).
Nurseries taking part included Daisy Roots, Floyds, Hare Spring, Jacques Amand, Pineview, Plants4Presents, Purbeck, Straight Mile, Swallowfields and W&S Lockyer. There was also a talks area and advice tent.