As a part of Panini America's Cyber Monday promotion they issued Cyber Monday packs to case-breakers only. So, this was a very limited release to only those who open up a ton of material (specifically, 2017 Immaculate Baseball & 2017 Rookies & Stars Football brands).
There is a 50-card base set, as well as, relic and autograph cards in packs. Go here for more information. Unfortunately, a complete checklist has not yet been compiled, but I do know there is at least one Dodger player available. It is of Cody Bellinger, and I have pics of both his base and relic cards below.