Activision plans to release a PC patch for Call of Duty World at War and is still working on Map Pack 2.
No date the patch yet, but zombie pathing issues, server refreshing, modding items and a few other fixes were mentioned over on the official forums.
Regarding the map pack, Treyarch community manager Josh Olin had this to say:
“We are continuing to work on support for Map Pack 2 on the PC. I have no specific information to provide on this yet, but I will update the community when there are more details.”
More is over on the official forums.