If it makes it live as is, however, it will make a lot of players very upset.
Rank reward summoner icons such as Season 2015 Solo Gold are in the mystery icon chest and can be pulled like any other icon.
3v3 Silver and 3v3 Challenger 3 I can also confirm.
If it's not too much trouble, I'd like to see other testers try and confirm or deny this.
please post your findings here.