But:
Our main hand (aka the one with the weapon) is the right one, but we are used to trigger the main action with the left button (In both MW and OB attack was left click), so attacking with right click would feel weird. But switching the two mouse buttons wouldn't be intuitive either.
Was there any official word on that yet? It probably can be configured. What do you think will be the default? How would you like to control fighting with a mouse?