Nothing I have read suggests that they are going to do that, so whilst it is possible,
I would see it as very unlikely. You are of course free to have a different view, but please try and not to shitty your pants whilst having that view.
Either way anyone who says 32nm quads aren't going to be released on LGA 1156 is just disillusioned. Intel is not going to invest millions into a chipset just to let it die out. What we may see is a larger disparity in price between the LGA 1156 and LGA 1366 chipsets with the budget and mainstream processors hitting LGA 1156 only to squeeze more money out of the LGA 1366 crowd, but even that is guessing.
I don't think people are ruling out that Intel might release a 3.2Ghz or 3.3Ghz Lynnfield Quad on LGA 1156, but that isn't going to be a cost effective upgrade from an i5-750 or i7-860 for most people. Maybe if you are into overclocking in a big way it could be feasible.