A thing to also keep in mind is that we are so far away from release that the devs probably don't know yet what will make it into the game in time for launch and what will be pushed to DLC's (free or otherwise).
Generally "good" devs like CDPR will put out content that was only half finished at launch as free DLC. Paid DLC is typically larger stuff where a lot of development time is needed post release, so this content might only exist scribbled on a post-it at this point.
I have faith that we will get a good quantity of both, based on how the Witcher 3 went.