A guess: The Sunni Taliban are now forming a new Islamic state to the west of Iran (joining eastern Syrian and NW Iraq) and this attack on the Pakistan airport is the start of forming a similar state to the east with sections of Afghanistan and Pakistan
No, this does not signal a tactical shift. It’s more of the same old plans. They are moving toward the creation of Islamic caliphate run by the Muslim Brotherhood, which would unite Sunnis and Shiites under shariya law meted out by the MB, but first they needed to get one country and kick out the secular government.
First they tried Egypt, then Libya and Syra (Libya was too chaotic). So, now, thanks to Obama, they are about to establish a stronghold in Afghanistan, their old stomping ground, with an expansion team that straddles Syria and Iraq.