1156 will die in q1 2011 with the introduction of socket 1155, 1366 however will be upgraded once with the 990x, which will remain the most powerful consumer chip, unless bulldozer says otherwise, until q3 2011 when socket 2011 for ultra high end sandy will be released
I would like to point out that the socket replacing LGA1366 will be LGA2011 NOT LGA1365 as you have stated. And yes, LGA1155 will replace LGA1156.
Thats wierd. I remember reading an article a while ago on Tom's (can't seem to find it now) about the new sockets and how they have only one less pin than the previous ones. The only reason I remember it is because I was wondering if the new chips with one less pin would fit/work in the older sockets possibly with a bios update. Looks like I'm out of luck for my 1366 system. But hey, the i7 920 is still kickin ass and will be for a while.