Call of Duty: Black Ops Cold War Open Beta

The crossplay beta for Call of Duty: Black Ops Cold War is now open to all. This can be accessed for Windows through the Blizzard client. This post from a couple of weeks ago has all the details on what to expect. Here's the overview:
During the Beta, experience signature Black Ops combat across traditional 6v6 modes, the higher player count 12v12 Combined Arms, and a brand-new 40-player mode, Fireteam: Dirty Bomb. The Beta will feature a selection of the game’s Multiplayer maps set in distinct global locations during the Cold War. Players can progress and rank up in the Beta-specific levelling system where loadout items, including new weaponry, covert spy tech through Field Upgrades, and badass Scorestreaks can be unlocked by earning XP.