Valve randomly selecting people for stress testing.
"We will prioritize group members that meet the following requirements:"

• Get in here: https://v1.steam.hlxgame.cc/groups/tfcompetitive
  
• Make sure your TF2 has premium dlc: "Have either purchased a copy of Team Fortress 2 prior to June 23, 2011, or have made a purchase from the Mann Co. Store. (AKA premium accounts)"
  
• Have Steam Guard Mobile Authenticator enabled.
  ( https://support.steampowered.com/kb_article.php?ref=8625-WRAH-9030 )
  
• Have a phone number associated with your Steam account
  ( https://support.steampowered.com/kb_article.php?ref=8625-WRAH-9030#addphone )

That Bad Rats 2 is officially in development.

For more Information, please visit 3rd-party steam database site: https://steamdb.info/app/393200/subs/

Teaser trailers: https://youtu.be/9ApOFe9ODZY https://youtu.be/8x0st4yKHfs