I think the answer is that they are not, at least not in an organized way. I'm sure however that if you did this and posted the results, they would be used.
John Dunn is preparing updated versions of at least the simpler unison settings, e.g., # 21, 23, and 24 for the revised HPSC. Unfortunately, I'm quite sure they won't be ready for distribution by Advent, 2011. By then, most parishes will have made their commitments to new or rewritten Mass settings.
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