From that link it looks like we'll probably only get a couple and then have to quest for more. I wish we could have them for all classes automatically even if we don't it's a lot better than what we have now.
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My only fear with these mannequins is that it'll be like FFXI where they stay in your house and you have to go back home to change clothes. It doesn't make sense for it to be like this, given the nature of the armory system, but at the same time it doesn't make sense to lug around a bunch of mannequins wherever you go. So, I dunno.
I think we could allow for a suspension of disbelief seeing as how otherwise you're carrying several sets of clothes and armor on your character =P