“Unlocked by participating in the support a streamer: Medic Brigitte event” 
Found it here on Reddit:
Update: You must gift 3 subs to selected streamers in order to get this skin:
10 Likes
This looks good
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The unlock description makes me worry that you may have to donate to a streamer.
Fingers crossed that is not the case haha 
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She looks more like an astronaut
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looks great! but… streamer crap
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When was this even a event??
It’s a unannounced event. No word on the news website yet.
Maybe they have revealed the skin a little too early.
There’s a whole subreddit for Brig mains?
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So true lmao, TO INFINITY AND BEYOND!
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There is also a whole subreddit for Bastion mains… although it’s hardly active as you’d probably expect lol
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That’s “Lt. Morales” from Heroes of the Storm.
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It really is… we going to ignore this tho
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Yikes. Between her redesign and this, I’m convinced the art team absolutely loathes her.
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What’s the “B” stand for, blizzard tokens?
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Skins that are “special” have the B icon such as Blizzcon skins.
The letter has the same font as the B in the Blizzard logo.
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I don’t like the sound of that. Oh well, not like the skin of a gutted support would’ve brought me back anyway. Ty.
It is the medic unit from SC
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I’ve been asking for a StarCraft medic skin for brig for at least 3 years
Success!!! (Maybe)
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“Watch 6 hours of streams for a special reward.”
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Pretty poggin skin. It looks different enough that it would be worth trying to convert it to a pepakura form and making a full suit out of it with EVA foam.