henriquejr found this interesting rumor based on SteamDB entry for The Witcher 3:
More information.CD Project RED has done an amazing job of keeping The Witcher 3 in the news post-release. Whether that's by responding to player issues with quick patches and a strong social media presence or with their planned 8 weeks of free DLC, keeping up an impressive two new pieces a week.
And we might have an idea of what's coming up next week - which is week 4 of 8 if you're keeping count. SteamDB has an info sheet which reveals some interesting details, including a breakdown of the size and titles of the DLC to date, as well as a couple of extra pieces we haven't seen yet.
The data is incomplete, probably because they aren't quite ready for release yet, but it looks like we're getting a new mission next week, as well as some extra Gwent cards. We haven't spent much time with the made up card game Gwent yet but by all accounts its quite good fun as a bit of a copy of Magic The Gathering. And any new free content is a thing to celebrate.
As ever, this information shouldn't be taken as any kind of official confirmation of the DLC, and we wouldn't be surprised if CD Project RED swap some of the content now that it has been leaked.