As far as I have heard of there have been no tier 2 and 3 skins added into the game as of now. Adding skins gives people the chance to spend a lot of time earning something they like. Is there any clue when these will come out?
I know that this game only came out on may 3rd but since then there have been 5 hot fixs including a new character, and during the beta bots could have tier 2 skins which means that they all ready have some skins past the developement phase wince the bets (in this video here : https://www.youtube.com/watch?v=PD9rGHLBN-s)

Seems like they might come with the first DLC pack. Just have to wait and see what they say

There are already a lot of threads on this please use existing ones.