At this time, there is not the ability to update a publish online document. But I would imagine it is a much-requested feature.
Thanks for the reply, Diane. Yes, having an "Update" feature would be great for remote project work.
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Of course my co-author Diane Burns is correct.
But think of it this way, those links are permanent. So your client has a version history of the document. :-) (Life = Lemon = Lemonade)
You may like it or not but PublishOnline feature will be used for far more than letting the client see the progress of the work. The client will share the link with colleagues, the finished work will be published on websites, facebook, twitter and more. To swap links in several places when you have made a change will not work. Example: What if a sales person uses the old price list?
Adobe has already announced that this ability is coming before year end.