Both LG and Samsung are boasting the fact that they are bringing us expandable storage on the LG G5 and Galaxy S7. It is commendable of LG and Samsung to offer this. This is what we have been asking for, for LG to not take it away and for Samsung to bring it back. We are getting what we asked for, mostly.
Android Marshmallow brought us a new feature called adoptable storage. This feature allows your phone to "adopt" external storage and use it as internal storage. Once adopted the storage is formatted and encrypted to your phone. This allows you to store apps and data to your external storage as internal!
LG and Samsung have decided to skip this feature on their phones. This is a pretty big disappointment. Both phones will only be available in 32GB models in the US. It is likely that these phones will ship with plenty of bloat giving you only about 22GB to actually use. There is the option to expand storage, but you will still only have 22GB or so of app storage, and anything on your SDcard won't be encrypted. Hopefully with root we can find a way around this.