If the rumors are correct, No. Want the 3.5 jack and sd slot. Not concerned for no 4K display, since going to a non pentile pixel array design should mean very good VR image quality with 1440p. 4K chokes on a computer with VR, yet alone a small footprint phone. 10nm is still not enough to keep heat down.
Anyhoo, IF the S8 has the 3.5 jack and sd slot- probably would get it.
Have really liked the S series since they started, in my case have gone the every other model and have been on the odd numbers, so while the S8 will probably be a great device, I will end up waiting until the S9 in 2018.