In short: You don't wanna know.
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No confirmation of Inventory expansion but the armoury chest must expend when the new classes come in there will not be enough room in the current armoury for all the main hands of all classes.
Currently there are 23 main hands and since they have announced Red Mage and Samurai, would bring us to 25, which would leave no room at all for weapon exchange, i.e. Relic or upgrade.
Ok, I tried it, and it turns out you can actually pick up more key items than there are slots. The key items interface simply adds an additional page when needed.
Normally, there's a "1" button at the top of the window (which I'd thought was a bit redundant, since there normally is only 1):
http://img2.finalfantasyxiv.com/acci...63c1c439ac.jpg
But then it'll add more as needed. Here's both pages when I had 26 items:
http://img2.finalfantasyxiv.com/acci...40662b4687.jpg
p.s. I still think currencies belong in the currencies window rather than in key items. There may be some tokens that could be appropriate as key items, though.