There are 100s of rumors.
Like for any apple product, I also started to hear many rumours about iPhone release date. At this time, no one from the press/media really knows when it will be released. The only way to understand is to catch a guy from Apple itself or should we go to China (Apple Factory)!!
The dates may vary in different countries, but I guess it will be released first in USA. I hope iPhone 5s will have bigger screen but most rumours tell me that it will be just a WISH.