The iPhone 6S will debut in a couple of days. But already one analyst is making predictions about the iPhone 7 with Ming-Chi Kuo of KGI Securities forecasting that Apple will make the iPhone 7 the slimmest model yet.
According to Kuo, it will be between 6 and 6.5mm slim. That would be a noticeable reduction in bulk from the iPhone 6, which comes in at a still-very-svelte 6.9mm.
Even so, the latest models of iPod Touch and iPad Air are 6.1mm thick, so the iPhone 6 would look a little portly next to them in a line-up. The iPhone 6 Plus is a little fatter, at 7.1mm. But then it is bigger, with a 5.5-inch screen.
If you were hoping for a hair-thin iPhone 6S on Wednesday, you could be disappointed.
The new model is said to be slightly thicker than the iPhone 6, because of a new, stronger aluminium construction and the Force Touch sensor inside.
The new type of aluminium is being used to allay fears of another 'bendgate', after some iPhone 6 Plus users complained that their handset bent out of shape while in their pocket.
The iPhone 6S and 6S Plus will be unveiled on Wednesday night.
The fun starts at 6pm, we'll be on hand to bring you all the news as it happens, so stay tuned.