The details we know, and take this with a grain of salt, as this leak has not been confirmed, are as follows:

• The game has been in development since 2018, less than a year after Jungle Inferno released.

• The game is a team-based, hero-based (ew), class-based (yay!), moba-like, third-person shooter.

• The project was originally code-named "Neon Prime" internally by Valve.

• This could be Valve's next major release since Half-Life Alyx.

• This is NOT a VR title.

• (Unconfirmed) Will release some time within the next few weeks or so.

• (Unconfirmed, highly likely) Uses Source 2.

This are what I have gathered so far. For a more in-depth explanation, please watch Tyler McVicker's video below.

https://www.youtube.com/watch?v=k8MqhEz6N_k

Keep in mind, these leaks HAVE NOT BEEN CONFIRMED. They could be wrong.