Colonel Cooper wrote:Before Dune was published in 1965 it was serialized over several issues of 'Analog' magazine between 1963 and 1965 - part one, 'Dune World' over three issues; part two, 'Prophet of Dune' over five issues.
Frank Herbert did some re-writing for the fix-up of the two parts to make the original novel in 1965, but it's been the same ever since. There was nothing cut out, so there's nothing to put back in.
Thanks Colonel Cooper, that's just about exactly what Byron Merritt told me about my question; I hadn't had a chance to post it yet.