I understand that is the thought communicated regarding what encryption is good for, but the people writing about it IMO don't truly understand what it does or its purpose. It isn't encrypting data to/from your phone, it isn't blocking your carrier or anyone else in between point A to B to see source/destination, all it is doing is prohibiting someone with physical access to the device to hack into it and obtain its data. If the NSA wants to look into you for whatever reason, they are not going to get physical access to your phone. 1) because they can't, NSA cannot operate inside of US borders and/or against US citizens and 2) because they don't need to, they can utilize existing sniffing tools and/or court orders to compel carriers/telecommunications companies to handover the data. Anything that is relevant to any government investigation are data logs, text messages, call logs, GPS entries, all stuff that isn't limited to the device itself.
The only thing this does is prevent people who are not authorized access to your data from seeing it, plain and simple. Carriers, etc. will always be authorized to access it, and they will always be able to share with whatever government agency is requesting it via court order or whatever other means are in place.
EDIT: the more I thought about it the more I felt the need to share a little more...it's true this came about the same time as public found out technology companies were sharing information with government agencies and it may be related as a way to lighten public perception, but it is just that - perception. Yes I understand "perception is reality" but as someone who understand telecommunications, data security, and encryption - this does absolutely nothing other than add as another marketing technique to add more sales.