With the Overwatch closed beta now underway, Blizzard has a word of caution for those of you who have not yet been admitted into "I get to play Overwatch!" club: Beware the allure of false beta keys! Because as it turns out, in this case all beta keys are false.
[BETA] Overwatch beta "keys" do not exist. Please be cautious of any emails, websites, or individuals that claim to offer them!October 27, 2015
In a separate tweet posted yesterday, Blizzard Customer Service explained that everything related to Overwatch beta access will be handled internally. "Accounts will be flagged from our end & emails will be sent to players who have access to the beta letting them know," it wrote.
There's no mention in either timeline of any particular beta key scam, but a quick search reveals several sites and at least one Facebook page (sorry, no linking to jerks) that promise to either deliver keys or explain how to get them. One site requires that a tool, either online or downloadable, be run to generate the key, which of course I would strongly—very strongly—urge you not to do.