This suggests strongly that Google is planning soon to introduce advertisements in Gmail application for Android.
Users of Android’s Gmail application has so far been free of intrusive advertising, but a review of recent application file (APK) made by Android Police is pointing in the direction of that soon may change.
Buried in the program, there is a new directory called “ads” along with messages, functions and classes it mentions advertising. In addition, the head of the function “Show Ad Preference Manager ()” the user directly to his own personal page for ad-settings on one’s Google account.
Exactly how the advertisements appear is not known, but it suggests at least strongly on that we will soon need to tolerate advertisements in Gmail application.