All five marques will have the opportunity to to do so, but it is not required.
All five V8 Supercar manufacturers have until the third of October to accept the invitation to re-homolgate their current packages in preparation for the 2015 season.
At the end of the day they will have to remain within the same parity window
V8SC technical director Damien White
The series recently held a test at Oakley and according to an official release, they have "ratified the existing homologation process but also led to advances that will be applied in future aerodynamic testing."
V8 Supercar statement
“After re-testing, and validating what we applied as aero parity this year, we considered it appropriate to allow the homologation teams the chance to understand what additional information is used now in that process,” said technical director Damien White.
“At the end of the day they will have to remain within the same parity window, however sometimes manufacturers have different agendas in terms of how their race variant looks, and this is an opportunity to accommodate that through the homologation teams.”
The homologation teams are as follows ... Ford Performance Racing, Holden Racing Team, Volvo Polestar Racing, Nissan Motorsport, and Erebus Motorsport. So far, it appears that all teams plan to use the same models next season as Ford has yet to confirm plans for the proposed FG X Falcon.
There were concerns regarding parity earlier this year and although Holden has once again emerged as the dominate marque, four of the five (with the exception of Nissan) have reached the top step of the podium at least once this season.