Here are a few pieces of info to tide you over:
First of all, the environments will be "up to 4 times larger than those found in God of War II," which immediately sounds enticing to the nth degree.
Secondly, and you may have heard this already, but Kratos will be able to climb atop Titans and ravage the earth from above; these controllable behemoths can be the size of the "Empire State Building." Thirdly, "thousands of dynamic lights and textures with quadruple the resolution...allows for realistic muscle striations, detailed facial expressions, and new heightened levels of brutality and gore." Yummy.
Fourthly, there will be all new weapons...
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