Eventually they will release him. His arrest is just a charade to please the masses who hates the US even more that they hate their government. I can understand their resentment towards their incompetent government, but the US helped Pakistan way much more than it deserved.
You can look at it as a publicity stun, and it is working so far.
You don't think it's important that he killed people and was found with all manner of suspicious things, what would Israel do??