The announcement came from David Vonderhaar on the Call of Duty forums where he explained that the texture installation will reduce stress on the Blu-ray drive and will not wear it out. Note though that installing the textures will not give you any performance gains on the PS3.
This is one the fans having been demanding for a bit. Black Ops 2 has an option to Install Textures to HDD.
Currently the amount of space required for the texture pack is unknown. Vonderhaar mentioned that the size will change during development.
It’s a non-trivial amount of HDD space to install all the textures. I don’t want to get into exactly [sic] numbers because anything can, and does change during development.
It’s also unknown as to whether the same feature will be available for the Xbox 360.
Call of Duty: Black Ops 2 launches on the PS3, Xbox 360 and PC on November 13.