The tips have been flowing in about OS 188.8.131.52 leaking for the 9500 GSM Storm. This compliments the same OS that came out for the 9530 CDMA version last week. It looks like the link originated from BlackBerryRocks but its hard to tell.
So what are you waiting for? Keep in mind that this is still buggy and lots of software will not work!
NOTE: Do not install this software if you do not know what you are doing. It may make your BlackBerry FUBAR or just plain angry.