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Other differences to add to what Ciml mentioned:-
Dmoz Category Links not showing on Web Search Page.
Although the Adwords are bigger (width ways) - Only the title is a link, like the serps, as opposed to the whole box.
I have done a number of searhes and have not found one premium (top adword) result at the top of the search results yet.
A sign of things to come or just a test - who knows.