There will be three new maps in total: Miami Strike (a rework of Miami, still 6v6), Mansion (a 2v2 and 3v3 map), and Golova (a new location for Fireteam).
There are also some new modes, such as Multi-Team Hardpoint, where ten squads of four fight for multiple hardpoints simultaneously. There will also be new maps and objects for Prop Hunt.
Black Ops Cold War is getting Gunsmith Customs. This allows you to mix attachments from weapon blueprints of the same weapon type.
Weapon balance adjustments are made exclusively for Black Ops Cold War. Specifically, the Krig 6, FFAR 1, Groza, Milano 821, KSP 45, LC10, MAC-10, AK-74u, RPG-7, 1911, and Magnum are adjusted better balance.
There will be two new operators that can be used in both Black Ops Cold War and Warzone: Terrell Wolf and Karla Rivas. Both belong to NATO. Wolf will be available from the start of this season, Rivas will be available mid-season.
The new weapon will be available during the season: the ZRG 20mm sniper rifle. According to publisher Activision, this weapon is intended for extremely long-range and has a fast reload time. You get it by completing the in-game challenge or purchasing the Jackpot Sniper bundle.