I personally don't believe that a patch will fix it, neither do I believe they are actually trying to. Look at the x360 and pc forums, they have specific topics about the bugs, I mean betehsda team has made topics about their biggest issues, yet here we are ps3 owners with the worst problem of all and they haven't even oficially said, "yes we screwed up with the memory leak thing". To be honest I was in love with this game the day I saw the trailer, but now I just believe this will remain broken or at best slightly improved, no..not even that really. I would recommend you to return your copy.
Bethesda's silence about the issue is indeed troubling. They've admitted the texture streaming issues on 360, but blurry textures are merely an annoyance. The PS3's lag issue is much more than an annoyance.
It's game breaking. After 40+ hours, the lag honestly renders the game unplayable.
This is a real and serious problem, not just some superficial glitch. Bethesda should address it directly.
Saying nothing could be taken to mean either that they don't care, don't know how to fix it, or worse - that they consider it unfixable. Regardless, the product should have never been sold in its current condition.