I really hate to be the cynic here but this is just a half arsed response to calm down all the people spam tweeting / emailing etc at blizzard to save the game
Thus far its clearly just a very small change to the system that already exists
While I hope they introduce other things like different skinned units for higher level rewards they haven't mentioned anything along those lines so I assume that if people calm down and stop nagging blizzard en masse then blizzard will likely not develop skins
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