Treyarch announced the PC version of Call of Duty: Black Ops will allow modding. However, these tools will not be available at launch, the developer states the mod tools will be released at some undefined point after the game hits retail shelves.
The announcement came on the official forums, where a Treyarch developer said that creating the tools was not a trivial amount of work and would therefore have to wait until after the game had shipped.
"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," said the Treyarch dev.
"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."