Because we don't know a lot about the multiplayer component featured in Call of Duty we've written up a bullet point list of what we do and don't know.
What we do know:
CoD will ship with multiplayer support.
CoD won't use the standard 'Class System' where you pick a player class at the start of each match. We're not sure what will be in its place.
Multiplayer will focus on squad combat and team work.
The player will be able to go prone.
All of CoD's Multiplayer gameplay and game modes are written with scripts, which will make it easy for players to make their own modifications.
You'll have a special reticule which will show you exactly how accurate you are.
What we don't know
What game modes there will be.
How many players will be supported.
If the game will ship with an In Game Browser.
If the game will have built in Voice Communication.
How many maps will be shipped with the game.
What kind of game modes we'll get (Deathmatch, Team Deathmatch, ect)
If we've missed something or you can answer a question please let us know.