On my newly jailbroken iPod touch, I dived into Real Racing 3's App, examining files, folders and their contents and discovered some interesting data. Mainly under the Vehicles folder. I found several cars that had files in there that are not in the game yet, meaning that FM is adding (or was previously adding) these cars to add to the game. I was pleasantly surprised to say the least, I suspect we may be seeing these cars soon:

Bugatti Veyron Grand Sport Vitesse

Hyundai Veloster

Aston Martin Vanquish

Aston Martin V12 Vantage

Lamborghini Countach

Marrusia

Mitsubishi Lancer Evolution

And I think the Lamborghini Senesto Elemento may have been in there too but I'm not sure...

I definitely hope we see these cars soon and I hope FM doesn't get in trouble because it just got leaked >< If an FM person wants me to put this back under wraps, (despitethe fact that it's publicly available) I will readily do so.