The cards feature the design of the 1952 set. Each week three new cards are released and they are available for only one week. The cards can be bought only through Topps.com. You can get the three of the week for $14.99 or individual cards for $7.99.
Despite the high price, I've decided (for now) to get the Cubs cards as they become available. I had to make that decision already because Ian Happ was among the three players in the week 2 offering.
I'm sure sometime down the line cards will be made for Kris Bryant, Anthony Rizzo, Javier Baez, Addison Russell, Kyle Schwarber, and Jon Lester. So for now, I'm in.