Psyonix recently revealed a bit of their roadmap for Rocket League. Among many announcements, the one that stood out was that the original three DLC packs will be bundled with the regular version of the game on all platforms.
Rocket League's first three DLC packs are Supersonic Fury, Revenge of the Battle-Cars and Chaos Run. All three of them will go free at some point in 2019 so if you were preparing to shell out the cash for them, you might want to think again where you are going to spend it. All three DLC packs were removed from sale when the announcement went live, in order to prevent disgruntled customers and potentially lines of refund requests.
Speaking of refunds, players who purchased any of these packs from 1 October 2019 onward will be eligible for refunds. Psyonix didn't state the exact date these packs will go free but there isn't much of 2019 left - it's just over two months from being over! Furthermore, Psyonix noted they will reveal the exact date soon.
The new cars that are currently behind the DLC lock but will become available to all players are Dominus, Takumi, Scarab, Zippy, Ripper and Grog. It will certainly be a good thing that players will get access to a wider variety of cars without shelling out extra cash but it's hard to imagine Psyonix are about to stop with introducing new four-wheeled football players.
There were several other announcements in the blog post though. For example, the developers on Season 12 competitive rewards, a new feature called Inventory Archiving for those who have too many things in their possession, announced that Frosty Fest 2019 will commence in mid-December 2019 and provided more info on Rocket League Esports Tickets.