The site has a brief description of the product:
The first and only concordance for the Revised Standard Version Catholic Edition (RSV-CE) of the Bible. This exhaustive reference tool contains over 15,000 words and 300,000 entries, and has listings for both the first and second editions of the RSV-CE. As easy to use as a dictionary, keywords and passages makes Scripture accessible to people of all walks of life.
All I can say is that this is a long time coming! Luckily, I was able to get a hold of a used Eerdmans Concordance to the RSV (including Deuterocanonical/Apocrypha) a number of years back.
There is, however, another fine Catholic Bible study tool coming soon that I am more interested in purchasing: Catholic Bible Dictionary by Scott Hahn. The publication date is set for June 16 and the publisher is Doubleday. I think the last specifically Catholic Bible dictionary that was published in English was that old 1965 Dictionary of the Bible by John L. Mckenzie. Update definitely needed!