A PFT article from March 2014 had this to say:

http://profootballtalk.nbcsports.com...llion-in-2016/

When the salary cap jumped from $123 million to $133 million last week, some suggested it could move to $140 million in 2015 and $150 million in 2016.

Think higher.

One source with knowledge of the process (but not the same source who was on the money — pun lame but intended — when providing info about the 2014 cap) tells PFT that the cap could spike to $145 million in 2015 and a whopping $160 million in 2016.
They were pretty close on the 2015 cap, so 160 in 2016 might not be out of the question.