Telling you ahead of time and with some specificity that there’s going to be a bunch of free DLC, then releasing it regularly, seems to work pretty well. It’s not earth-shattering stuff (armor sets and new missions and some cosmetic stuff), but it makes you feel like the company’s paying attention to the game, and isn’t sourly wishing that you’d stop playing it and buy one of their new games. I also don’t mind the prospect of paying for meatier DLC later, this way. Mostly because I’m more likely to believe that it will be meatier.
So, hey, good job there, Projekt Red. Hey, look! Free advertising, too!