Microsoft and Turn 10 has announced that they will continue their partnership with V8 Supercars (began in 2002). This means at least one car from all five constructors represented in the Aussie V8 Supercar series will be in the game, and using the livery editor, you can create any car from the 2015 season.
Here is the full list of the V8 Supercars from Australia with picture and model. Turn 10 has also announced a bunch of other cars as well, which can be found at the bottom of this news piece.

2015 Holden #1 Red Bull Racing Australia VF Commodore

2015 Holden #22 Holden Racing Team VF Commodore

2015Holden #97 Tekno Autosports VF Commodore
2015 Holden #14 Freightliner Racing VF Commodore
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2015 Ford #5 Pepsi Max Crew PRA Falcon FG X
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2015 Ford #17 Xbox Racing Ford Falcon FG X
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2015 Mercedes-Benz #4 Erebus Motorsport E63 AMG V8 Supercar
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2015 Mercedes-Benz #9 Erebus Motorsport E63 AMG V8 Supercar
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2015 Volvo #33 Wilson Security Racing GRM S60
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2015 Nissan #23 Nissan Motorsport Altima
The rest of the announced cars, including a Battletoads edition of Dodge Challenger SRT Hellcat (stop teasing us and do a proper Battletoads, please!):
2011 HSV GTS
1981 Ford #55 Liqui Moly equipe Capri Turbo
1973 Ford XB Falcon GT
2017 Ford F-150 Raptor
2001 Acura Integra Type-R
1971 Lotus Elan Sprint
1992 Lancia Delta HF Integrale EVO
2015 Honda #28 Andretti Autosport IndyCar
2015 Honda #27 Andretti Autosport IndyCar
2015 Chevrolet #1 Team Penske IndyCar
2015 Honda #25 Andretti Autosport IndyCar
1980 Abarth Fiat 131
1993 Nissan Skyline GT-R V-Spec
1982 Lancia 037 Stradale
1986 Lancia Delta S4
2013 Abarth Punto Supersport
2011 Alfa Romeo Giulietta Quadrifoglio Verde
1997 Mitsubishi GTO
1994 Nissan Fairlady Z Version S Twin Turbo
2009 Vauxhall Corsa VXR
2011 Lotus Evora S
2010 Renault Clio RS
2003 Renault Sport Clio V6
1989 Toyota MR2 SC
1986 Alfa Romeo GTV-6
2014 Lexus IS 350 F Sport
1980 Subaru BRAT GL
2015 Dodge Challenger SRT Hellcat Battletoads Edition