It's random card, sometimes it's one of the new ones of the week. It's never been any of the ones on the demo carousel (I guess they want you to keep buying them off of there).
I had the subscription where you got 4 a day and it filled in pretty much of the lower number cards in the 3 months I subscribed, but it did give me a bunch of the cards that were new for the week and I was still able download the free VIP card each month. 121 cards a month for the price was great, I only stopped because I didn't have enough hard drive space at the time.