Earlier this month, Google announced several updates for AdWords, including group level impression share metrics for the search and display networks.
As Google explained, advertisers will start seeing three new columns that can be added to the ad groups tab. These are: Impr. Share, Lost IS (Rank) and Exact Match IS. Impr. Share shows the percentage of impressions you received divided by the estimated number of impressions you were eligible to receive. Lost IS (Rank) shows the share of impressions lost due to your d Rank. Exact Match IS (for the search network only) shows the percentage of impressions you received for searches that exactly matched your keyword divided by the estimated number of exact match impressions you were eligible to receive.
There's also an algorithm update to provide more accurate campaign impression share metrics. Changes include: refined campaign-level stats and once-a-day updates.
Now, these updates are rolling out.
Google posted the following update to its Inside AdWords blog:
Starting today, we will begin rolling out updates to your Impression Share metrics, which include new ad group-level impression share metrics as well as revised campaign-level impression share metrics. We've also changed the frequency with which we update this data to once a day. These updates will be in effect in all accounts globally over the next few days.
Google also announced recently that it rolled out two improvements to Automated Rules in AdWords: an increase to the rule limit and the ability to undo changes made by a rule. More on all of this here.