It's not exactly main stream but there are groups like Graphic Audio doing great work that will probably lead down this road.
They do a full cast audiobook with sound effects, music, etc. and they tend to be altered slightly to work in the medeium - would not be surprised if the differences continue to grow.
Yet... audiobooks' are still pretty much just books. There is no theatre-2-film difference between the mediums. It's more like hardbacks and soft covers.