Stars of the month collectibles

Hoolio99

I cant find any info on these collectibles, I have a few I was gonna save but my son decided to spend all my coins on packs...so I was going to sell them but would like to know what they are used for?

ESPOtheDON

Don't know just yet, most likely a set coming out next week

Hoolio99

I better hang on to them, thanks.