Well the biggest thing will probably be the new gpu's they will probably be the biggest change. I can only guess that intel will come out with a new socket but 2011 socket will be like what the 1155 socket is now. And as for motherboards sure new ones will come out but I can't think of any major differences that could possibly take place. So it really depends on what your budget is and if you will be able to afford these thing.
I can afford up to 3K USD that's why I feel we are close to end of the 7000 Gen and new gen will release but any idea when ?