Activision and Treyarch have announced that open beta for Call of Duty: Black Ops 4 will commence on 11 August 2018 and anyone who has a Battle.net account can participate. The specs are meant fro players interested to do some free testing.
Even though anyone with a Battle.net account will be able to participate in the beta, there is currently no way to pre-load the files. Depending on players' connection speed, it may take a chunky bit of time to download them as the requirements list 25 GB of hard disk space will be needed.
Keep in mind that the given system requirements are for the beta event only, and will likely change once the game fully releases. The changes will most likely be the to disk space required only though, as other requirements usually carry over from beta to final product.
Minimum PC requirements include i5 2500k CPU and GTX 660 2GB GPU, as well as their AMD equivalents, so players will technically be able to run the game on hardware from 2013. Keep in mind that GTX 1050 is also listed in minimum requirements, also with 2GB RAM, so make sure you don't fry your GPU if it has less memory. As far as the regular RAM goes, the beta will require at least 8GB as well as Windows 7 or higher operating system.
Those who want to enjoy the full perks of PC master race will, however, need newer hardware, although the recommended requirements are still not sky high. CPU will need to be at least i7 4770K, which was once a high end processor, but it also dates back to 2013. GPU requirements listed are GTX 970 or 1060 6GB for nVidia and R9 390 or AMD RX 580 for AMD GPUs. Recommended RAM is 12 GB and operating system is 64 bit Windows 10.
Assuming you have the right rig and Battle.net account, you will be able to give Black Ops 4 a whirl during the weekend in six modes - Team Deathmatch, Domination, Hardpoint, Kill Confirmed, Search & Destroy and Control across six maps. There is no Blackout on the list, so we'll have to wait for our first glimpse at Call of Battle Royale a while longer.