Big news from TreyArch's PCDev Via Twitter:
Dedicated Servers are re-confirmed, Developer Console is confirmed, and Modtools will be released sometime post-launch. Also, lean has been re-added for the PC version.
Quote from PCDev:
We plan to open the game up for modding sometime post-launch. We do not know yet to what extent you will be able to mod the game. There are some purely technical issues related to engine and internal tool enhancements that do not easily fit the modtools paradigm. We have looked at it close enough to see that it is non-trivial and we will have to pick it up again post-launch. Right now we are completely focused on finishing the game.
And, dev console: confirmed.
original article