In an interview (http://www.doyouevengamebro.net/we-talk-sniper-ghost-warrior-3-with-senior-level-designer-tomasz-pruski/) with CI Games' senior level designer it was confirmed that Sniper Ghost Warrior 3 will have multiplayer.
As previously confirmed the game will be open world.
The campaign will take about 30 hours to complete.
Moreover, the development budget for the game is 7x that of its predecessor. Something for the 6.6 million owners of the series to look forward to.