It won't be access control after Mansehra. Actually it would be a 2 lane highway on a virgin alignment after Mansehra till a place after Battagram. After Battagram, it will be upgrade of existing KKH instead of new road.
Please keep in mind that access control motorway is not always required. After Battagram, populated areas are very less and traffic is greatly reduced. Hence for next 10-15 years, this road is likely to suffice the requirement. We can have the example of Murree Expressway, which is not access controlled, but still it is quite beneficial for ppl going to Murree.
In a similar case, there are posts about ppl talking of motorway in Baluchistan not being 4, 6 lane or access controlled. The fact is that there is too less traffic and population in Baluchistan. Sometimes, no other vehicle is seen for miles. Therefore, going for proper 6 lane motorway would be an overkill (at least for time being).