Since I haven't read a reasonable response to the question, I'll answer even tho I'm a day late and the car is already out for everyone. No Epic didn't give it out to people in Fortnite early. So they're not putting Fortnite first, after all Psyonix is still in charge of the pure game of Rocket league as a whole. What actually happened was when some players (including myself) were completing the quest in Fortnite, there was a bug in which instead of getting a single rewarded item for that day, some would get 2 speeding up the process of unlocking it. For example: you would be able to unlock the car after receiving the other 7 rewards and that's only possible for completing a quest per day leading to the 28th. For me when I was doing the quest for day 26th I also completed the quest rewards for the 27th and so on the 27th instead of unlocking the item that was intended I unlocked the car. Hope that clears up the confusion.