What is "League +"

On my friendlist, in the place where statuses should be shown, a bunch of my friends have "League +" written. https://cdn.discordapp.com/attachments/625899021843824650/642475987472220170/unknown.png Is it like a new app or something?
Best New

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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