in the near future on the ad groups will add three new columns:
* Impression Share: interest received visits divided by the estimated number of impressions, which could be obtained.
* Loss of impression share (position): percentage of impressions that your ad spared due to low Ad Rank. Information about lost impression share (position) does not appear if the tested range of dates during the day to use the whole or almost the entire budget (the budget limit).
* Exact match, impression share: (only the search network) percent of the impressions received from the searches to your exact match keyword divided by the estimated number of impressions exact match.
That can be very useful. dont You?