I wouldn't say it's our current game plan. The prices for unlocking a Void Storage vault, depositing items, and withdrawing items are all still under discussion, so there's definitely a possibility that one or all of them may change before patch 4.3 is released.
Also, I know you mentioned that the costs are not final, but is the current game plan to be 1k activation and 100g for every item deposited or withdrawn? That seems to be what is indicated in the screenshots.
I realize this is still in consideration and there's a good chance you will change your mind anyway, but I still feel the need to say - 100g per item for an 80-150 storage bank... for a system that's intended to benefit the players who are collectors, I feel more like I'm being punished if I'd use it. I'm not hurting for money by any means, but paying 1,000g to start plus 15,000g to fill up every slot, plus extra when I move stuff in and out seems a tad harsh. Are we really trying to get gold out of the economy that badly?
I still appreciate the idea, but, yikes. On transmogrification alone, considering there's 14 visible items you can equip, the expense of swapping a set out and in would be 2,800g each time, plus the transmogrification removal and reapplication fees would probably put you over the 3k mark. Way to make talent respecs look like a must-go clearance sale, LOL!
I would say I don't intend to change my gear very often, but who knows? I might wear something new every time the Tuesday raid reset comes along... I mean, come on, wearing the same outfit to the same raid twice in a row - that'd be downright embarassing!
And yes, with the combination of PvP gear, tier sets, miscellaneous RP gear, tabards, holiday stuff, unique looking weapons, and the multitude of other things I've hoarded over the years, I have no doubt I will fill up the entire thing on the first day. :P
Again, much appreciated along with the transmogrification, but way too steep for me at the moment. ;)