This announcement comes in a somewhat interesting form, via a gif response to a Twitter user asking if the game will receive the same treatment that The Witcher 3 got.
It is nice to see that CD Projekt Red will offer free DLC for those who do not purchase the expansions. What will the DLC's include? Probably new quests, items, alternate looks, and more. If they follow the same track that The Witcher 3 received, we may see a New Game + mode in the future!