Tidemand

Will we hear the secret humming language between Count Fenring and his wife in Dune?

Or this secret message language:

"DISTRANS: a device for producing a temporary neural imprint on the nervous system of bats or birds. The creatures normal cry then carries the message imprint which can be sorted from that carrier wave by another distrans."

I can't see how that could be a spoiler more than discussing the Fremen language.