Mobile apps report

Across all mobile platforms, nearly 90 percent of all downloads from app stores will be free apps in 2012. And, according to a new report, 90 percent of the apps for which users are willing to pay will cost less than $3. Total downloads this year are projected to be nearly last year's figure. In 2012, the total number of app downloads is forecast to grow by an enormous 83 percent and continue to grow at a rate of about 50 percent to 79 percent each year through 2016. As that happens, according to Gartner, the percentage of free app downloads will continue to grow as well.
Gartner. (2012).  Market Trends: Mobile App Stores, Worldwide, 2012. Stamford, CT: Gartner.
http://www.gartner.com/DisplayDocument?ref=clientFriendlyUrl&id=2126015