It's not yet clear how the multiplayer cards from TB are going to be handled. Players who purchase TB, will get the cards for "free". I suspect CDPR will also give players an option to craft them, instead, for those that are not interested in TB.
I like how you put the word FREE in quote.
Gwent is generous, i thinks they will make you do some simple quest and give you those cards (like leader cards quest).
What i still wonder is after 30+ hours of gameplay what more can you do, does it have unlimited side quest or end of story, to be honest 30+ hours is not that long, maybe 2 or 3 day to finish and then what, back to Gwent, i guess. Maybe if the numbers is good they'll make DLC and more "FREE" card so you don't dry pass.