There is no excuse whatsoever for to not put out an update to fix the exploit that was found. Right now it's ok that there's no fix because it only exists in a closed lab. However since that group is explaining the vulnerability to the Black Hat conference on Aug. 2nd, there is no excuse for there not to be a fix out by then. The iPhone is particularly vulnerable because it relies heavily on online "applications." All some hacker (the evil kind) would need to do is design a semi-popular iPhone app that iPhone users would flock to, then exploit away. I would be very happy to wake up tomorrow to the first iPhone patch.