Ah, gee, we really don't know if this is "most likely" what the iPhone 8 will look like. It might, but it might not. Apple has tried a number of different configurations, and just possibly, this might be one of them. We'll know better sometime in August, when real parts start getting stolen.
You must be new here. Literally every year (except for 2007 and 2008) the design of the new iPhone leaks. Literally every. Single. Year.
They are producing millions of these things. The launch is a little over 2 months away. There are hundreds if not thousands of people involved with this project.
What we are seeing is accurate.