Next season's Women's Super League is expanding to 12 teams, while two teams have been added to Division 1 of the National League.
The expanded top division Super League will take on a conference format for the 2020-21 season only, with regular season games on a home and away basis against the five other teams from the same conference and one fixture each against the six teams from the other conference.
Trinity Meteors and St Mary's Castleisland, who had been due to play a promotion/relegation playoff at the end of last season against Marble City Hawks before the Covid-19 pandemic led to its cancellation, are promoted from Division 1 to the Super League.
Hawks also retain their place in the top tier.
Meanwhile, Division 1 will see a new National League team in the shape of LYIT Donegal, while St Paul's Killarney return after an eight-year absence.
"We are delighted to see LYIT Donegal joining the National League and St Paul's Killarney returning after a long absence. Both teams impressed the WNLC with their applications and will be strong additions to our league," said Chair of the Women's National League Committee Breda Dick.
"We are also looking forward to the new Super League Conference format with an exciting play-off climax to the season too."
The Super League's North Conference will be made up of DCU Mercy, Pyrobel Killester, Trinity Meteors, IT Carlow, Leixlip Amenities Liffey Celtics and Maree.
The South Conference will also feature six teams: Ambassador UCC Glanmire, Fr. Mathews, Brunell, St. Mary's Castleisland, Marble City Hawks and WIT Waterford Wildcats.
The top three teams in each conference advance to the playoffs, with top teams qualifying directly for the semi-finals.
Basketball Ireland had previously confirmed that pre-season training could resume from 20 July, subject to Government guidelines, with each club obliged to appoint a Covid-19 Compliance Officer.