The 16GB iPhone has been Apple's entry-level option for some time now, despite being more than a little controversial. Still, despite some rumors to the contrary, it looks like the company is sticking with it: 9to5Mac reports that the the iPhone 6S and 6S Plus will have the same storage options as the iPhone 6 and 6 Plus, starting at 16GB and moving up to 64GB and 128GB. On-contract pricing, the site also reported, will likewise stay the same as 2014 models: $199, $299, and $399 for each storage tier of the 6S, and $299, $399, and $499 for the 6S Plus.
Update: Read the iPhone 6S review.
9to5 also dropped a couple tidbits about what we can expect from the phones: a similar design, but with the new "7000 series aluminum" Apple has used in the Apple Watch Sport. The report also says Apple will unveil new colors for Apple Watch Sport bands at the September 9th event.