The England and Wales Cricket Board wants to introduce an innovative '100 balls' format into its new eight-team, city-based tournament.
The concept could see innings consist of 15 traditional six-ball overs, and a final 10-ball over.
That would be 20 balls shorter than traditional T20 matches.
Those devising the competition believe a 100-ball 'countdown' would attract new audiences and be popular with broadcasters.
Photo: Photosport
The proposed approach has been presented by the ECB to the chair and chief executives of the first-class counties and MCC.
"This is a fresh and exciting idea which will appeal to a younger audience and attract new fans to the game," said the ECB's chief executive officer Tom Harrison.
Southampton, Birmingham, Leeds, London, Manchester, Cardiff and Nottingham have been selected as venues for the five-week competition, which starts in 2020.
Both Lord's and The Oval will host newly-created teams in the competition with the Ageas Bowl, Edgbaston, Headingley, Old Trafford, the Swalec Stadium and Trent Bridge the other grounds chosen.
The new competition will take place alongside the existing T20 Blast which is expected to be unaffected by the proposed format changes.
The ECB believes the concept will help to appeal to families and a more diverse and younger audience, and provide some distinction from the T20 Blast.
It will feature aligned competitions for both men's and women's teams, with the same format and team identities.
-BBC
