Previewed at WWDC, launching in the fall.
Details on Upcoming Mac Ads?
The new ads take a page from Apple's old Switch Campaign by again featuring users who have switched from Windows to Mac. Of particular note, it appears that Apple may specifically hilight users who have switched to the Mac after purchasing an iPod -- articulating the "iPod Halo Effect".
The iPod Halo effect is a term that has been used by analysts and industry experts to describe the eventual conversion of iPod sales into long term Mac sales as consumers slowly adopt more Apple technology.
It is unknown when the ads will air.