Call of Duty 7, What We Know.

The game doesn't even have a release date, but that hasn't stopped Call of Duty 7's Mulitplayer Design Director, David Vonderhaar, posting a few chunks of information on the games forums. The information was found in a discussion about killstreaks, yet it talks about all aspects of multiplayer.

• It is highly likely the Commando perk will not make a return, the developers were not a fan of it.
• They tried a version of the sentry gun kill streak, which had to be manned, they weren't impressed by it either.
• The team really disliked having shotguns and machine pistols as secondary weapons, they felt it gave the player too much firepower. It is likely only pistols and launchers will return.
• The knife or some version of a knife may also become a secondary weapon.
• The nuke will not return, the team did not like it.
• Custom killstreaks will likely return.

This is all the information that could be taken from Davids posts, he says releasing this information is in support of Treyarchs' ethics regarding the community and listening to feedback.