http://www.pcgamer.com/overwatch-league-skins/

We wondered back in October if the advent of the Overwatch League meant that players would be given the opportunity dress up their Overwatch avatars in OWL-themed skins. Today, Overwatch League commissioner Nate Nanzer confirmed that the answer is yes: "Home team uniforms" for all OWL teams will be available for purchase early next year. 

League skins will be available for all Overwatch heroes, and will be purchasable with Overwatch League tokens, a separate in-game currency that Nanzer said will enable Blizzard to ensure that League-based revenues are properly distributed between the teams. The token system will be used for all OWL-related in-game items, and players who log into the game within a month of the League's launch will be given enough tokens to buy their first skin.