Retainer Clarification

[worldofneil]

The 10th retainer is actually apart of the $5 premium package, no separate additional 2 dollar charge.

I'm afraid not. Not according to the Live Letter anyway:

The premium plan adds various additional features such as inventory management between retainers, the ability to purchase an additional retainer on the Mog Station, and also doubles the capacity of the saddlebag.

Apparently (according to Reddit) Yoshida was also quite insistent on stream that it didn't include the retainer, just the ability to hire.