Defense budget? It's expected to hit $ 16 billion by 2018-2019, another jump to $ 20 billion by 2022 and by 2025, they expect Pakistan to be the top 15th economy with a defense budget of $ 25-30 billion. Of course, these estimated are subjected to continuous growth of the economy, political stability and expected return from all economic related activity.
But I can easily see a $ 16-20 billion budget in the next four years (on par or slightly above Turkey's defense budget). Pakistan's current budget for defense is running around $ 10 billion and due to various operations going on against terrorists in FATA, a couple of billions are allocated additionally. So already direct and indirect budget is $ 10-13 billion. Now add growth of $ 4-5 billion with 4-6% GDP growth over the next 3 years, a $ 3-4 billion increase isn't that big.