Rugby Australia has invited Western Force to join the Rebels, Waratahs, Reds and Brumbies in a new competition.
Tom Wright and Solomone Kata scored two tries apiece to lead the Brumbies to their fourth consecutive victory over the Waratahs.
Wollongong set the stage for back-to-back Super Rugby clashes on Friday, with the Brumbies and the Chiefs enjoying victories.
Australian Conference rivals the Brumbies and the Reds enjoyed big wins on Saturday, the leaders recovering from an outbreak of mumps.
The Brumbies looked to be heading for victory following a Folau Fainga'a hat-trick, but they were unable to hold off the Highlanders.
Irae Simone set the ball rolling for the battling Brumbies in a fine win over the Rebels, while the Sharks dazzled against the Highlanders.
Warren Gatland rung the changes with the Chiefs behind and was rewarded with victory, while the Brumbies also triumphed.
With hazardous air quality in Canberra, the Brumbies have temporarily relocated to Newcastle.
Rugby League's Warriors and Union's Blues will play a double header against their respective Canberra-based opponents next year.
A fast start helped the Jaguares brush past the Brumbies in the Super Rugby semi-finals.