It turns out Modern Warfare 3 patch 1.15 for PS3 is due mid-June, as it was originally suggested.
A few days ago, Infinity Ward published the official patch notes for two title updates for PS3 and PC that were pushed out at the time. PC players were able to download the patch on the same day, but there was no time frame given as to when PS3 users can expect the major title update.
As pointed out to us by MP1st reader Moriarty, Infinity Ward has since added a date to the patch notes indicating a June 14th release date for title update #15. You can find the patch notes through here, which include 5 new prestige levels and reduction to the explosive radius of the dreadful Dead Man’s Hand.
Also, considering that all May DLC was released on Xbox 360 Elite along with patch 1.15 on May 15th. It’s safe to assume that PS3 Elite subscribers will receive similar treatment on or around June 14th (30 days after the 360 patch). You can find what Xbox 360 premium users received with patch 1.15 here.