Hello, I'm really sorry that it took so long (we were looking for some more elegant solution and apparently it is not possible), but hyph-utf8 is now loading two copies of patterns with apostrophe, once with U+0027 and once with U+2019.
The fix should be in TeX Live Pretest (but for some reason there was no update of repositories today in the morning, so maybe tomorrow). Mojca -------------------------------------------------- Subscriptions, Archive, and List information, etc.: http://tug.org/mailman/listinfo/xetex
