Yes
there will be comeing an iphone 5s and iphone 6 left and thats it
Apple's newest generation mobile phone after iPhone 5S, 5C...
If you're most concerned about price, you could get the 5S because they are less expensive than the 6 will be when it's released, and you won't have to wait to buy it. But you won't get the latest features that the 6 will have. If you want the latest features and you're okay with paying more and waiting a few more months, then you could go for the 6.
an iphone 5s
Because you say iPhone 5S instead of iPhone 6, you seem to sound completely comfortable with an iPhone that will undergo plenty of under-the-hood changes will little change to the looks. I would say it is definitely worth waiting the month.
The iPhone 5 has an 8 megapixel camera on the rear and a 1.2 megapixel camera on the front. It has the same camera as the iPhone 5c and the iPhone 5s.
The flashlights on all iPhone devices/models are just about the same. This is primarily because the flashlight is the same as the flash of the camera.
Not yet but it will be released for iPhones running iOS 6 and 7 on 22 September 2013
If iphone 5s is $649 then iphone 6 would be around $700-$850
This is an assumption but I would probably say there will be a 5S. Here is my logic, Apple will almost definitely make another iPhone before the 6 that is identical to the 5 that way (assuming the iPhone 6 will have a bigger screen like people have reported) Apple will not be selling iPhones in three different screen sizes. In other words, instead of selling a 3.5inch 4S, a 4inch iPhone 5, and a 4.x inch iPhone 6 they would have a 4inch iPhone 5, 4inch iPhone 5S and 4.x inch iPhone 6. This also supports the chance to launching two iPhones, the 5S and 6 (or possibly one of those plus a budget iPhone with a 4 inch screen). *please keep in mind this answer is not factual but is based on my opinions and rumors from leaked information, I have no knowledge of what Apple's next iPhone will be called nor if a larger screen is even planned any time soon.
The Apple iPhone 5 was released to mixed reviews on September 21, 2012. Rumor places the release of the next iPhone, to be called either the iPhone 5S or the iPhone 6, as early as the first half of 2013.
The iPhone 5c weighs 4.65 ounches. It is heavier than the iPhone 5 and 5s which weight 3.95.