A few Android users can install Android apps from within the mobile search results, bypassing a step to the Google Play store.
Artem Russakovskii reports that a couple of Android users are now able to install Android apps directly from the mobile Google search results.
He shared a screen-shot showing the install progress from within the mobile search results interface:
Ordinarily, the searcher would be taken into the Google Play interface to review the app details and then click install from the Google Play app. In any case, it seems Google is testing bypassing that step by allowing a few Android users to install Android apps directly within the mobile results.
This should help app developers get more app downloads, if it does indeed go live for all Android users.
I doubt Google will be able to do the same for iOS users.