The game, developed by Tencent studio Timi, will be basically a normal Call of Duty except made for smartphones. It will offer maps and game modes known from the main games’, so for example you will be able to play Team Deathmatch on the famous Nuketown map. CoD: Mobile will have various customization options (which will almost certainly make use of microtransactions). Judging by the end of the trailer, Battle Royale mode will be added some time after launch; Fortnite and Apex, beware.
CoD: Mobile will be available in North America first, with South America and Europe following suit soon. If you want to register for the game’s beta, you can do it here.