Hi Robert,
Unfortunately this is not currently supported, but I will make an effort to get this implemented for the next release. Currently view permissions are set at the page level. I don't want to do role checks on every content item on a page, but I am willing to add support for Hide From Unauthenticated and perhaps Hide From Authenticated so that its also easy to remove content after the user signs in.
I suppose there currently is one workaround that would produce the same effect, but it would involve having 2 "Home Pages", one without the authenticated content on the right, you would go into Page Settings for this page and set it to "Hide From Authenticated". Then you would create another "Home" Page and set the view role to "Authenticated Users". So when the user logs in the first page dissapears and the second one appears.
Best,
Joe