Counter-Strike 2 is available now on Steam and is free to play

destructoid.com:

They probably don’t teach this in PR and marketing classes. In typical Valve fashion, Counter-Strike 2 is officially released as of 4:40 p.m. ET on a Wednesday. The highly anticipated FPS sequel completely replaces Counter-Strike: Global Offensive and brings graphical updates and new features to the competitive shooter.

CS:GO is officially no more, as it will automatically change to Counter-Strike 2 in your Steam Library. CS2 is completely free-to-play, though players can purchase an optional $14.99 Prime Status upgrade. It appears Prime Status will feature its own special matchmaking and enable Prime Status players to obtain exclusive item drops and weapon cases.

This is the first new Counter-Strike title in over a decade as CS:GO was released in August of 2012. Cosmetics players have earned in CS:GO will automatically update to their new Counter-Strike 2 version, making it a seamless upgrade for all players. However, new players can download right away and jump in and start playing as well.

Also, according to the new Steam Page, CS2 is built in the Source 2 engine. This allows Valve to utilize realistic physics-based rendering, state-of-the-art networking, and upgraded Community Workshop tools.

Even though Counter-Strike 2 is technically an upgrade of the framework in CS:GO, there are some pretty big new features in it as well:

While many are surely excited to jump into CS2, it appears some players are having trouble getting in. Though the new version of the shooter is technically live, some are not seeing the updated change in their Steam Library. I had this issue as well and restarting Steam worked for me. Before I restarted Steam it still showed as Counter-Strike: Global Offensive for me. But, after restarting