In default Ubuntu 12.04 LTS lens collection the applications lens show you results from Ubuntu Software Center and the music lens shows you results from Ubuntu One Music Store. But there are no direct reviews visible without clicking. That's the selection most ordinary users will see for the next two years unless they pick up half-yearly release.
In 12.10, Amazon is added with the shopping lens and also via video lens for at least those in US. There are now also the Dash previews where you can see ratings, reviews etc. directly in Dash and I'd guess more in time.
You can remove the external site scopes and lens, or if you really want then you'll probably be able to select more suppliers in the future. I'm personally quite fine just the semi-local search / developer oriented lens, although with proper local movie partners that might change. Wikipedia search, LDAP search are uses that are quite nice for Dash.
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