With 12 clubs competing, the programme will provide each with 22 league fixtures. In addition, a knock-out tournament is to be introduced. League matches will begin early next season, perhaps in late August, with the final games in May.
"This is what we have been looking for since the competition was introduced two years ago," said David Jordan.
"We now have a guaranteed programme of at least 27 matches. We'll have the 22 in the Celtic League plus at least one in the new knock-out competition, and if the Parker Pen Cup format remains as it was we'll have at least four European matches."