Some months ago Silvery broke this news here on Webmasterworld.
Official Google announcement
Place Search: a faster, easier way to find local information
10/27/2010 11:00:00 AM
My immediate thoughts are with the data providers such as Yellow Pages and with the SEOs who set up business models around the 7-pack. Now the whole page (of 100) is a pack of 30-40 results. It hasn't rolled out here in Australia, but Google provides a preview URL:
[edited by: engine at 8:17 am (utc) on Oct 28, 2010]
[edit reason] fixed url [/edit]