This is a pretty small update, but Google announced on Google+ that they added a new tab to show those who run shopping campaigns the impression share by device on the Campaign and Ad Group level.
Since mobile device usage is way up, Google wanted to surface this data to advertisers, so they can better understand and tailor their campaigns.
Google wrote:
To make this information more accessible and give you more flexibility in reporting, you can now view impression share for computers, mobile devices and tablets at the Campaign and Ad group level. Look at your Lost IS (rank) segmented by device to see your mobile share of voice and use Auction insights to understand how you stack up against your competition. Use this information to determine which Ad groups or Campaigns have the most mobile opportunity and increase your mobile bid modifier to achieve your desired goals. In addition to an increase in impression share, increasing your mobile bid modifier makes your ads more likely to appear in the first portion of the mobile ad unit, where CTR can increase by up to 3X.^
Forum discussion at Google+ .
