single player vs AI ?

Will this be a single player game?

Well, we could expect a single player campaign like the one we had in Mordheim with progress in several missions and working up to story missions.

And i guess we will have too skirmishes as PVP multiplayer

Removing Single Player didn't work for EA so I wouldn't think that a much smaller company would attempt to try it. The main focus was Single for Mordhiem, I wouldn't think for a moment they'd consider cutting what most of their fans did most of the time. It's not a strategy for success.

Yes, this will be a single player game, just like Mordheim: City of the Damned was.
How it will be formed and what aspects of Mordheim they will carry over, we don't know yet.