Jlime is currently working on 680 / 690 machines
and the guy is hoping to do a 720 / 728 version
but only has a 680 himself.
He is asking for somone to donate a 720
http://www.jlime.com/phpBB2/viewtopic.php?t=21
unfortunatley I'm not rich either so I doubt we'll
see a 720 / 728 version.
Regards
Niteman1969