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well it depends which u prefer Intel or AMD , bcuz Intel plans to release i9 a 6 core/12 threads processor on 1366 socket , but on the other hand AMD plans to release AMD “Thuban” Six-Core Desktop Processor , its desktop version of AMD's server CPU "Istanbul" , it wil hav support for AM3 socket, so its upto u which u prefer
1156 is the new mainstream desktop socket
1136 is now highend/ workstation socket
1136 will have some mighty 6cores in the future though, no-one knows the roadmap for the 1156 yet as far as i know
Just because i9 will be S1366 doesn't mean it will work with current motherboards.
Do not buy to future proof, the concept is not applicable to computing. Buy what is appropriate now.
AM3 seems the likeliest one, since AMD usually lag behind Intel when adopting new RAM types.