1) Based on the trailer, we will be getting a larger variety of weapons, including dual katanas, a flintlock rifle, and a kusarigama.
2) With how oversaturated the pvp genre is, I think it would be better if they kept the pve mode they had in the last game.
3) I'm pretty sure the bodies were left out to intimidate the Mongols, kinda like showing how remaining in Tsushima will cause spontaneous and sudden death. Hiding the bodies kinda defeats the purpose of an "avenging shadow of death."
