Ok in socket 1155 for gaming I would have to say that the Intel® Core™ i5-3570K is the better gaming processors since so few games will use more than 4 threads. For this reason the Intel Core i5-3570K can clock up to the same clock speed and does have hyper-threading that you won't be using.
Now as to the question of releasing a new socket 1155 processor? I havent seen anything in the roadmaps but we don't always release future products on the roadmaps. I would think that if we were going to release a new socket 1155 Intel Core i5 or Intel Core i7 we would have done it before the Christmas buying season was in force; just like we did with the Intel Core i7-3970X Extreme Edition.