I have been asked by many of you to try to get some info about the autofocus speed. I asked around and the answer I got is that the contrast autofocus is very fast. At least as fast as the Panasonic GH1 / GF1 autofocus. But we will have to wait until the official NEX release to be sure of that.
Another question was how many frames per second both cameras do have.
A first rumor I recieved says that the NEX3 will have 5fps and the NEX5 7fps. But I still need to doublecheck that news.