Starting on August 11th, the multiplayer open beta will be exclusive to Battle.net and will feature six modes, Team Deathmatch, Domination, Hardpoint, Kill Confirmed, Search & Destroy, and Control. It will also feature a total of six maps, four seen earlier and two new maps, Gridlock and Hacienda.
Treyarch also revealed both minimum and recommended PC system requirements and was keen to note that these are only for the beta, so it might change once the game officially launches on October 12th.
According to the list, you'll need at least Core i5-2500K or AMD equivalent CPU, 8GB of RAM, 256GB of storage space and Nvidia GTX 660 2GB/1050 2GB or AMD HD 7850 graphics card. Bear in mind that this will probably be enough to run the beta at both lower resolution and without much eye-candy, although Treyarch did not reveal any specific data.
On the other hand, recommended specifications are a bit higher, with Core i7-4770k or AMD equivalent, 12GB of RAM, same 25GB of storage space and either Nvidia GTX 970/GTX 1060 6GB or AMD's Radeon R9 390/RX 580.
The game will work on Windows 7 64-bit or later but Treyarch recommends Windows 10 64-bit OS.
As noted, multiplayer Beta will start on August 11, 2018, with early access starting a day earlier. You can find more details over at the dedicated beta page.