Yes, it is special. The National Archive has been trying to educate us on what need to know and what we are going to find.
You can find this information at 1940 Census Records. The videos are a wonderful tease to get us really interested. The videos are at 1940 Federal Population Census - Videos.
Here are the Videos:
The 1940 Census - Introduction
The 1940 Census - Census of Population
The 1940 Census - Census of Housing
The 1940 Census - Census of Agriculture