No, need for new provinces. Just abolish the provincial assemblies - only National Assembly should legislate uniform laws for whole country and act as monitory body over local governments. Delegate administrative and budgetary powers to
current divisions within provinces Provincial executive/Mayor/Chief is directly elected by people, also the courts. Provinces should be symbolic (with only Governor designation) to keep the relevance of acronym PAKISTAN, and to avoid unnecessary trouble of emotional people who are against division of their "Dharti Maa".