Sanzar wants to unveil the format for their next Super rugby deal by Christmas.
If the mid-year test window is shifted to July in 2016 as the New Zealand, Australian and South African partners hope, they will rework a competition to finish before that international timetable.
"We will know the format we are working towards but these things occasionally have something unravel as they go along," chief executive Greg Peters said.
"There will not be any more weeks in Super rugby, I can guarantee that. We are at the maximum point with 21 weeks which allows each team 16 pool games, two byes and a possible three-week run in the finals."
NZRU chief executive Steve Tew said the timetable for the new broadcast deal would ideally be agreed within the next few months and then work done on the broadcast sale process and plan.