Companies are hoping to be first to provide accessories for the new iPhone so there guessing at this point using the rumors as a baseline but in most instances they will not be accurate
I suggest you wait until you are sure there made for the new devices before you purchase them
They do, but many case makers build cases based on leaked specs that are not accurate...or at least fab up some shiny, pretty pictures to show them off to garner attention to their company. It gets people looking at their crap, and visiting their websites and/or ebay/amazon stores, and even if the cases are never made, the damage has been done and people have seen them. Happens every year.