that might help you with your question. whether or not it will be "enough" is hard to know becuase our definition of enough might be different. it should be able to play it, and play it very well, but we cant tell until it is out.
Based on the benchmarks I've seen, the 770 has able to run all of the latest titles smoothly with maxed out settings, beating the 680 and 7970. I think if you get rid of your old graphics card and replace it with something like the 770 you should have no problem running the next generation games on your pc. However, I don't know about the 760 ti it hasn't been released yet but I'm sure it will be a major improvement from the last generation 660 ti (considering the 770 is an upgrade from the 670 and the 660ti performs almost identically to the 670).