Snort wheeze can be done without a call and sounds more realistic that way......the growl, I am sure it will work for some this fall but don't think it will be the latest and greatest call out there.
Companies have to change things to appeal to the gimick guru's that have the latest stuff. Without the new products, sales go down each year.
Look at the Encore Pro Hunter for example....same gun as far as shootability but just a few new features and name and you have quite a few people buying a new gun. Same can be said for the new compounds.
To answer the question, I think it is a new money maker for the industry with at least an ounce of validity as it mimicks a deer vocalization.