Blizzard will be taking punitive action against those players who have made use of an exploit involving Mei on the Ecopoint Antarctica map. The news was announced via a post on the game's official forums yesterday evening.
The exploit - which we won't detail here as the fix has yet to be applied to the servers - allows Mei players to assume a position on the map which is not intended to be accessible. This provides the player in question with a clear advantage.
It's come about as a result of a bug which the Overwatch developers have had difficulty tracking down, although it seems as though a fix will be applied before the end of today.
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Lead developer Jeff Kaplan has confirmed that some kind of punishment will also be applied to those who have made use of this exploit, although what exact form this punishment will entail is unclear. If you've taken advantage of this exploit, it seems likely you'll receive at least a temporary ban from the game.
Here's the full post for you:
Hi. This bug was surprisingly tricky for us to track down but we believe we have identified a fix. Our hope is to have it fixed sometime tomorrow (1/5/2017 PST) but there is always the chance that our fix could fail. We're currently testing to verify the fix.
This bug is clearly an exploit and we consider this cheating. Do not attempt to reproduce this bug. If you see someone abusing this mechanic, please report them.
We will be taking action against those who abused this exploit. Overwatch is a PvP experience so that means exploiting game mechanics like this comes at a cost to those you are competing against. We take aggressive action against people who abuse game mechanics, hack or cheat. This case is no different.
Apologies that this bug lingered for as long as it did. Hopefully this should go away soon (along with those who abused it).