Google announced that starting on October 15, 2014, they may or may not decide to show your second line of ad text on mobile search results. Google said this will be done to make the ads "more relevant and useful information to your customers."
There are a couple options:
(1) Your ad extensions may show instead of the second line of ad text (description line 2) on your mobile search ads.
(2) Description line 2 may or may not show, depending on how well it’s expected to perform.
Here is a picture:
I am sure not every advertiser will be happy about this.
To learn more, see this blog post.
Forum discussion at Google+.
