I remember participating in the 1940 Census indexing. I doubt much will have changed in the technology involved. The process is somewhat slow and painstaking, but for good reason. Handwriting on some of the Census entries is atrocious and sometimes illegible. Best guesses are made by an initial indexer, and if you get a series of pages that are clear, the process goes quickly. If you get one that is very sloppy, the process crawls. Then a second more trusted indexer reviews all the work, and if there are discrepancies, then those all have to be cleared up before the site will publish the findings. So other than "hopefully" the number of volunteers who help index the source pages, I doubt much will have changed.
But on the other hand, the source pages without the index should be available on or around April 1, so from there it's a matter of self-indexing or manual hunting to find the data you're looking for.