Kevin just announced [1] that his lightweight version of Plex86 will
be relicensed to the MIT license, which is basicaly an open permission for everyone to relicense it and release propietary versions of Plex86. [2]
Personaly, i wouldn't like any contributions of mine to Plex86 to become non-free software, so i think this is a valuable reason to keep this fork going.
[1] http://sourceforge.net/mailarchive/forum.php?thread_id=2078828&forum_id=26580
[2] http://www.gnu.org/philosophy/x.html