This has a number of articles of interest to developers.
Smartphones projected to overtake feature phones for the first time in 2013
Android fragmentation predicted to squeeze out independent developers
Google and Amazon are headed for a major clash (see this Google News post for another example).
New Amazon API takes on Google for Android ad dollars
The Evolving Economics of the App
Android To Be 58 Percent Of App Uptake
What Smartphone OS do You Use?