Most likely won't work on Sprint or Verizon (won't matter for a lot of people, but for over half of US consumers, that matters). The rumors I saw indicated around $700 price tag, which is pretty different so not sure what's correct there. I have zero faith it'll be supported any longer than the S7 devices, which means it's not worth buying in 2017. It's still unable to fly, etc. It's still the worst device of 2016 (yes, it sounded awesome on paper, but the real thing was absolutely horrible). The S8+ exists and is a better device (better than the Note 7 or the same as it on every line item except S-Pen), the Note 8 will exist and will be a better device in every imaginable way. For non Samsung options, the G6, U11, Pixel XL, iPhone 7+, V20 and possibly the OnePlus 5 are already better devices, available now without any hassles. We're two months away from the next season of devices which will introduce 4-5 more devices that are much better.
That's a few reasons.