Well, for the cost of Stormblood, I'm pretty sure I heard it from Yoshida during the Stormblood Expansion announcement tho, same as the fact that they'll try to make one new race/ one new class per expansion pack during the Heavensward Expansion annoucement. I can't find any video related to that but, I didn't go on the internet looking specifically for the cost of Stormblood. It's a thing I heard during a Fanfest Video or Live Letter and which stayed in my mind.

I'm not even makin a discussion subject like that to complain but to understand why. Maybe there are great features but main of them which were annouced are not relevant to me... : /