Congratulations Samsung! You've begun using the same security practices that everyone else has been using for years. Am I right to assume that, up till now, Samsung hasn't been using this "Secure Zone" technology? As far as I can tell, "Secure Zone" is just another way of saying "we've separated the kernel space programs from user space programs", something with every other modern OS has been doing for years.
Also, while the server-to-client encryption is more than welcome, it would be nice if they stopped eves dropping on their customers' conversations in the first place. I think they missed the part of Nineteen Eighty-Four where spying is bad.