There will be spicy jhumlas uttered over this but no actual action like a war for retaking PoK will take place if that's what you mean.
They can make it 5th province or start calling it Kashmir for all i care, everything in that country is a jhol.
Since Independence that region is being filled with Pathans and Punjabis to get rid of the 3 native Shia tribes that live on those mountainous areas, so it doesn't really matter.
In the end this declaring GB as a province is a BeFFiTiNG rEpLY to 370 Gaya in the minds of Abduls from Rawalpindi, they will still continue to do randi rona with keywords like plebiscite, UN resolution, disputed area, mudi hitler etc etc.
The next step building on surgical strike, balakot bombings, 370 gaya will be to retake GB-PoK by surprise, pakis are very weak now, we cannot let this opportunity go.