Ah it'll probably still have a minimum funding level. I don't imagine that being a dollar short will be any different to a few points.
I'm still happy to see them ditching the space bucks, in any case.
I've been in the beta - It lets you just make the purchase for any item directly to the card. Even lets you apply any cash in your 'wallet' or whatever they call it to the purchase. No more buying more than needed from what I can tell.