Will Modern Warfare 3 have Dedicated Servers?
Yes! Modern Warfare 3 supported matchmaking as well as Dedicated Servers, allowing players to find and filter via an in-game server browser or set-up their own Dedicated Server for complete control, without being restricted by any 3rd party hosting requirements. If looking for a Dedicated Server to join, if you choose not to set up your own, you can filter and favorite by Ping, Map, Gametype, Hardcore Variants, Voice, Password, and many other options.
Are Dedicated Servers Ranked or UnRanked?
Only matchmaking to public games are Ranked (meaning, you have to rank up to unlock weapons to rank on the leaderboards), choosing to play on a Dedicated Server is UnRanked. Meaning unlocks are completely controlled by the Server Admin. They can choose to unlock everything or limit class restrictions to whatever they like to fully customize the experience. You do not have to rank up in Public games to have access to weapons in Dedicated Servers, you have complete control over what is unlocked for you in a Unranked Dedicated Server.