I still have conflicting reports but as far as I've been able to figure out, the 5.5" Galaxy S8 will be revealed in April alongside a larger 6.2" S8 Plus. These phones will be 90% screen on the front, with fingerprint sensor embedded under the screen. I don't believe that the S8 Plus is the replacement for the Note, because there are three different models for next year. That leaves the Note 8 for August. No screen size has been outed for the Note 8 yet, but all three are expected to have 4K UHD screens. AWESOME for VR use!
LG has been tapped to provide the batteries for next year's Galaxy devices.