Since now we know that the FBI demanded already mid 2015 to crack systematically iPhones (see the decision of a juge in NY) and Tim Cook refused already at that time to do this, and since apple bought an enterprise being specialized on security firmware in 2015, I think at least on the hardware- side the SE will be well-equipped, maybe already on the firmware/IOS side...
Maybe also that the 1-week delay of the presentation is due to the first reaction of apple about the totalitaristic demands of the FBI... ( in the New York case apple's lawyers stated that the USA demanded even more iPhones to be cracked than China did...)
I have two iP 5 and my privacy concerns are the only reason why I upgraded on IOS9 and why I will replace them either with two 5s (additional hardware- security) or two SE (+ up-to-date processor = hopefully futureproof until 2019) ...